Update documentationgh-pages

author: 2015-06-29 20:16:15 +0000
committer: 2015-06-29 20:16:15 +0000
commit: 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree: 8c64d6e8be006486d975a651505fbbde61365cd6 /src/regex_syntax
download: irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.tar.gz
irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.tar.xz
irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.zip
2 files changed, 7216 insertions, 0 deletions
diff --git a/src/regex_syntax/lib.rs.html b/src/regex_syntax/lib.rs.html
new file mode 100644
index 0000000..7c8b82b
--- /dev/null
+++ b/src/regex_syntax/lib.rs.html
@@ -0,0 +1,2465 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="generator" content="rustdoc">
+    <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/regex-syntax-0.1.2/src/lib.rs`.">
+    <meta name="keywords" content="rust, rustlang, rust-lang">
+
+    <title>lib.rs.html -- source</title>
+
+    <link rel="stylesheet" type="text/css" href="../../main.css">
+
+    
+    
+</head>
+<body class="rustdoc">
+    <!--[if lte IE 8]>
+    <div class="warning">
+        This old browser is unsupported and will most likely display funky
+        things.
+    </div>
+    <![endif]-->
+
+    
+
+    <section class="sidebar">
+        
+        
+    </section>
+
+    <nav class="sub">
+        <form class="search-form js-only">
+            <div class="search-container">
+                <input class="search-input" name="search"
+                       autocomplete="off"
+                       placeholder="Click or press 'S' to search, '?' for more options..."
+                       type="search">
+            </div>
+        </form>
+    </nav>
+
+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">   1</span>
+<span id="2">   2</span>
+<span id="3">   3</span>
+<span id="4">   4</span>
+<span id="5">   5</span>
+<span id="6">   6</span>
+<span id="7">   7</span>
+<span id="8">   8</span>
+<span id="9">   9</span>
+<span id="10">  10</span>
+<span id="11">  11</span>
+<span id="12">  12</span>
+<span id="13">  13</span>
+<span id="14">  14</span>
+<span id="15">  15</span>
+<span id="16">  16</span>
+<span id="17">  17</span>
+<span id="18">  18</span>
+<span id="19">  19</span>
+<span id="20">  20</span>
+<span id="21">  21</span>
+<span id="22">  22</span>
+<span id="23">  23</span>
+<span id="24">  24</span>
+<span id="25">  25</span>
+<span id="26">  26</span>
+<span id="27">  27</span>
+<span id="28">  28</span>
+<span id="29">  29</span>
+<span id="30">  30</span>
+<span id="31">  31</span>
+<span id="32">  32</span>
+<span id="33">  33</span>
+<span id="34">  34</span>
+<span id="35">  35</span>
+<span id="36">  36</span>
+<span id="37">  37</span>
+<span id="38">  38</span>
+<span id="39">  39</span>
+<span id="40">  40</span>
+<span id="41">  41</span>
+<span id="42">  42</span>
+<span id="43">  43</span>
+<span id="44">  44</span>
+<span id="45">  45</span>
+<span id="46">  46</span>
+<span id="47">  47</span>
+<span id="48">  48</span>
+<span id="49">  49</span>
+<span id="50">  50</span>
+<span id="51">  51</span>
+<span id="52">  52</span>
+<span id="53">  53</span>
+<span id="54">  54</span>
+<span id="55">  55</span>
+<span id="56">  56</span>
+<span id="57">  57</span>
+<span id="58">  58</span>
+<span id="59">  59</span>
+<span id="60">  60</span>
+<span id="61">  61</span>
+<span id="62">  62</span>
+<span id="63">  63</span>
+<span id="64">  64</span>
+<span id="65">  65</span>
+<span id="66">  66</span>
+<span id="67">  67</span>
+<span id="68">  68</span>
+<span id="69">  69</span>
+<span id="70">  70</span>
+<span id="71">  71</span>
+<span id="72">  72</span>
+<span id="73">  73</span>
+<span id="74">  74</span>
+<span id="75">  75</span>
+<span id="76">  76</span>
+<span id="77">  77</span>
+<span id="78">  78</span>
+<span id="79">  79</span>
+<span id="80">  80</span>
+<span id="81">  81</span>
+<span id="82">  82</span>
+<span id="83">  83</span>
+<span id="84">  84</span>
+<span id="85">  85</span>
+<span id="86">  86</span>
+<span id="87">  87</span>
+<span id="88">  88</span>
+<span id="89">  89</span>
+<span id="90">  90</span>
+<span id="91">  91</span>
+<span id="92">  92</span>
+<span id="93">  93</span>
+<span id="94">  94</span>
+<span id="95">  95</span>
+<span id="96">  96</span>
+<span id="97">  97</span>
+<span id="98">  98</span>
+<span id="99">  99</span>
+<span id="100"> 100</span>
+<span id="101"> 101</span>
+<span id="102"> 102</span>
+<span id="103"> 103</span>
+<span id="104"> 104</span>
+<span id="105"> 105</span>
+<span id="106"> 106</span>
+<span id="107"> 107</span>
+<span id="108"> 108</span>
+<span id="109"> 109</span>
+<span id="110"> 110</span>
+<span id="111"> 111</span>
+<span id="112"> 112</span>
+<span id="113"> 113</span>
+<span id="114"> 114</span>
+<span id="115"> 115</span>
+<span id="116"> 116</span>
+<span id="117"> 117</span>
+<span id="118"> 118</span>
+<span id="119"> 119</span>
+<span id="120"> 120</span>
+<span id="121"> 121</span>
+<span id="122"> 122</span>
+<span id="123"> 123</span>
+<span id="124"> 124</span>
+<span id="125"> 125</span>
+<span id="126"> 126</span>
+<span id="127"> 127</span>
+<span id="128"> 128</span>
+<span id="129"> 129</span>
+<span id="130"> 130</span>
+<span id="131"> 131</span>
+<span id="132"> 132</span>
+<span id="133"> 133</span>
+<span id="134"> 134</span>
+<span id="135"> 135</span>
+<span id="136"> 136</span>
+<span id="137"> 137</span>
+<span id="138"> 138</span>
+<span id="139"> 139</span>
+<span id="140"> 140</span>
+<span id="141"> 141</span>
+<span id="142"> 142</span>
+<span id="143"> 143</span>
+<span id="144"> 144</span>
+<span id="145"> 145</span>
+<span id="146"> 146</span>
+<span id="147"> 147</span>
+<span id="148"> 148</span>
+<span id="149"> 149</span>
+<span id="150"> 150</span>
+<span id="151"> 151</span>
+<span id="152"> 152</span>
+<span id="153"> 153</span>
+<span id="154"> 154</span>
+<span id="155"> 155</span>
+<span id="156"> 156</span>
+<span id="157"> 157</span>
+<span id="158"> 158</span>
+<span id="159"> 159</span>
+<span id="160"> 160</span>
+<span id="161"> 161</span>
+<span id="162"> 162</span>
+<span id="163"> 163</span>
+<span id="164"> 164</span>
+<span id="165"> 165</span>
+<span id="166"> 166</span>
+<span id="167"> 167</span>
+<span id="168"> 168</span>
+<span id="169"> 169</span>
+<span id="170"> 170</span>
+<span id="171"> 171</span>
+<span id="172"> 172</span>
+<span id="173"> 173</span>
+<span id="174"> 174</span>
+<span id="175"> 175</span>
+<span id="176"> 176</span>
+<span id="177"> 177</span>
+<span id="178"> 178</span>
+<span id="179"> 179</span>
+<span id="180"> 180</span>
+<span id="181"> 181</span>
+<span id="182"> 182</span>
+<span id="183"> 183</span>
+<span id="184"> 184</span>
+<span id="185"> 185</span>
+<span id="186"> 186</span>
+<span id="187"> 187</span>
+<span id="188"> 188</span>
+<span id="189"> 189</span>
+<span id="190"> 190</span>
+<span id="191"> 191</span>
+<span id="192"> 192</span>
+<span id="193"> 193</span>
+<span id="194"> 194</span>
+<span id="195"> 195</span>
+<span id="196"> 196</span>
+<span id="197"> 197</span>
+<span id="198"> 198</span>
+<span id="199"> 199</span>
+<span id="200"> 200</span>
+<span id="201"> 201</span>
+<span id="202"> 202</span>
+<span id="203"> 203</span>
+<span id="204"> 204</span>
+<span id="205"> 205</span>
+<span id="206"> 206</span>
+<span id="207"> 207</span>
+<span id="208"> 208</span>
+<span id="209"> 209</span>
+<span id="210"> 210</span>
+<span id="211"> 211</span>
+<span id="212"> 212</span>
+<span id="213"> 213</span>
+<span id="214"> 214</span>
+<span id="215"> 215</span>
+<span id="216"> 216</span>
+<span id="217"> 217</span>
+<span id="218"> 218</span>
+<span id="219"> 219</span>
+<span id="220"> 220</span>
+<span id="221"> 221</span>
+<span id="222"> 222</span>
+<span id="223"> 223</span>
+<span id="224"> 224</span>
+<span id="225"> 225</span>
+<span id="226"> 226</span>
+<span id="227"> 227</span>
+<span id="228"> 228</span>
+<span id="229"> 229</span>
+<span id="230"> 230</span>
+<span id="231"> 231</span>
+<span id="232"> 232</span>
+<span id="233"> 233</span>
+<span id="234"> 234</span>
+<span id="235"> 235</span>
+<span id="236"> 236</span>
+<span id="237"> 237</span>
+<span id="238"> 238</span>
+<span id="239"> 239</span>
+<span id="240"> 240</span>
+<span id="241"> 241</span>
+<span id="242"> 242</span>
+<span id="243"> 243</span>
+<span id="244"> 244</span>
+<span id="245"> 245</span>
+<span id="246"> 246</span>
+<span id="247"> 247</span>
+<span id="248"> 248</span>
+<span id="249"> 249</span>
+<span id="250"> 250</span>
+<span id="251"> 251</span>
+<span id="252"> 252</span>
+<span id="253"> 253</span>
+<span id="254"> 254</span>
+<span id="255"> 255</span>
+<span id="256"> 256</span>
+<span id="257"> 257</span>
+<span id="258"> 258</span>
+<span id="259"> 259</span>
+<span id="260"> 260</span>
+<span id="261"> 261</span>
+<span id="262"> 262</span>
+<span id="263"> 263</span>
+<span id="264"> 264</span>
+<span id="265"> 265</span>
+<span id="266"> 266</span>
+<span id="267"> 267</span>
+<span id="268"> 268</span>
+<span id="269"> 269</span>
+<span id="270"> 270</span>
+<span id="271"> 271</span>
+<span id="272"> 272</span>
+<span id="273"> 273</span>
+<span id="274"> 274</span>
+<span id="275"> 275</span>
+<span id="276"> 276</span>
+<span id="277"> 277</span>
+<span id="278"> 278</span>
+<span id="279"> 279</span>
+<span id="280"> 280</span>
+<span id="281"> 281</span>
+<span id="282"> 282</span>
+<span id="283"> 283</span>
+<span id="284"> 284</span>
+<span id="285"> 285</span>
+<span id="286"> 286</span>
+<span id="287"> 287</span>
+<span id="288"> 288</span>
+<span id="289"> 289</span>
+<span id="290"> 290</span>
+<span id="291"> 291</span>
+<span id="292"> 292</span>
+<span id="293"> 293</span>
+<span id="294"> 294</span>
+<span id="295"> 295</span>
+<span id="296"> 296</span>
+<span id="297"> 297</span>
+<span id="298"> 298</span>
+<span id="299"> 299</span>
+<span id="300"> 300</span>
+<span id="301"> 301</span>
+<span id="302"> 302</span>
+<span id="303"> 303</span>
+<span id="304"> 304</span>
+<span id="305"> 305</span>
+<span id="306"> 306</span>
+<span id="307"> 307</span>
+<span id="308"> 308</span>
+<span id="309"> 309</span>
+<span id="310"> 310</span>
+<span id="311"> 311</span>
+<span id="312"> 312</span>
+<span id="313"> 313</span>
+<span id="314"> 314</span>
+<span id="315"> 315</span>
+<span id="316"> 316</span>
+<span id="317"> 317</span>
+<span id="318"> 318</span>
+<span id="319"> 319</span>
+<span id="320"> 320</span>
+<span id="321"> 321</span>
+<span id="322"> 322</span>
+<span id="323"> 323</span>
+<span id="324"> 324</span>
+<span id="325"> 325</span>
+<span id="326"> 326</span>
+<span id="327"> 327</span>
+<span id="328"> 328</span>
+<span id="329"> 329</span>
+<span id="330"> 330</span>
+<span id="331"> 331</span>
+<span id="332"> 332</span>
+<span id="333"> 333</span>
+<span id="334"> 334</span>
+<span id="335"> 335</span>
+<span id="336"> 336</span>
+<span id="337"> 337</span>
+<span id="338"> 338</span>
+<span id="339"> 339</span>
+<span id="340"> 340</span>
+<span id="341"> 341</span>
+<span id="342"> 342</span>
+<span id="343"> 343</span>
+<span id="344"> 344</span>
+<span id="345"> 345</span>
+<span id="346"> 346</span>
+<span id="347"> 347</span>
+<span id="348"> 348</span>
+<span id="349"> 349</span>
+<span id="350"> 350</span>
+<span id="351"> 351</span>
+<span id="352"> 352</span>
+<span id="353"> 353</span>
+<span id="354"> 354</span>
+<span id="355"> 355</span>
+<span id="356"> 356</span>
+<span id="357"> 357</span>
+<span id="358"> 358</span>
+<span id="359"> 359</span>
+<span id="360"> 360</span>
+<span id="361"> 361</span>
+<span id="362"> 362</span>
+<span id="363"> 363</span>
+<span id="364"> 364</span>
+<span id="365"> 365</span>
+<span id="366"> 366</span>
+<span id="367"> 367</span>
+<span id="368"> 368</span>
+<span id="369"> 369</span>
+<span id="370"> 370</span>
+<span id="371"> 371</span>
+<span id="372"> 372</span>
+<span id="373"> 373</span>
+<span id="374"> 374</span>
+<span id="375"> 375</span>
+<span id="376"> 376</span>
+<span id="377"> 377</span>
+<span id="378"> 378</span>
+<span id="379"> 379</span>
+<span id="380"> 380</span>
+<span id="381"> 381</span>
+<span id="382"> 382</span>
+<span id="383"> 383</span>
+<span id="384"> 384</span>
+<span id="385"> 385</span>
+<span id="386"> 386</span>
+<span id="387"> 387</span>
+<span id="388"> 388</span>
+<span id="389"> 389</span>
+<span id="390"> 390</span>
+<span id="391"> 391</span>
+<span id="392"> 392</span>
+<span id="393"> 393</span>
+<span id="394"> 394</span>
+<span id="395"> 395</span>
+<span id="396"> 396</span>
+<span id="397"> 397</span>
+<span id="398"> 398</span>
+<span id="399"> 399</span>
+<span id="400"> 400</span>
+<span id="401"> 401</span>
+<span id="402"> 402</span>
+<span id="403"> 403</span>
+<span id="404"> 404</span>
+<span id="405"> 405</span>
+<span id="406"> 406</span>
+<span id="407"> 407</span>
+<span id="408"> 408</span>
+<span id="409"> 409</span>
+<span id="410"> 410</span>
+<span id="411"> 411</span>
+<span id="412"> 412</span>
+<span id="413"> 413</span>
+<span id="414"> 414</span>
+<span id="415"> 415</span>
+<span id="416"> 416</span>
+<span id="417"> 417</span>
+<span id="418"> 418</span>
+<span id="419"> 419</span>
+<span id="420"> 420</span>
+<span id="421"> 421</span>
+<span id="422"> 422</span>
+<span id="423"> 423</span>
+<span id="424"> 424</span>
+<span id="425"> 425</span>
+<span id="426"> 426</span>
+<span id="427"> 427</span>
+<span id="428"> 428</span>
+<span id="429"> 429</span>
+<span id="430"> 430</span>
+<span id="431"> 431</span>
+<span id="432"> 432</span>
+<span id="433"> 433</span>
+<span id="434"> 434</span>
+<span id="435"> 435</span>
+<span id="436"> 436</span>
+<span id="437"> 437</span>
+<span id="438"> 438</span>
+<span id="439"> 439</span>
+<span id="440"> 440</span>
+<span id="441"> 441</span>
+<span id="442"> 442</span>
+<span id="443"> 443</span>
+<span id="444"> 444</span>
+<span id="445"> 445</span>
+<span id="446"> 446</span>
+<span id="447"> 447</span>
+<span id="448"> 448</span>
+<span id="449"> 449</span>
+<span id="450"> 450</span>
+<span id="451"> 451</span>
+<span id="452"> 452</span>
+<span id="453"> 453</span>
+<span id="454"> 454</span>
+<span id="455"> 455</span>
+<span id="456"> 456</span>
+<span id="457"> 457</span>
+<span id="458"> 458</span>
+<span id="459"> 459</span>
+<span id="460"> 460</span>
+<span id="461"> 461</span>
+<span id="462"> 462</span>
+<span id="463"> 463</span>
+<span id="464"> 464</span>
+<span id="465"> 465</span>
+<span id="466"> 466</span>
+<span id="467"> 467</span>
+<span id="468"> 468</span>
+<span id="469"> 469</span>
+<span id="470"> 470</span>
+<span id="471"> 471</span>
+<span id="472"> 472</span>
+<span id="473"> 473</span>
+<span id="474"> 474</span>
+<span id="475"> 475</span>
+<span id="476"> 476</span>
+<span id="477"> 477</span>
+<span id="478"> 478</span>
+<span id="479"> 479</span>
+<span id="480"> 480</span>
+<span id="481"> 481</span>
+<span id="482"> 482</span>
+<span id="483"> 483</span>
+<span id="484"> 484</span>
+<span id="485"> 485</span>
+<span id="486"> 486</span>
+<span id="487"> 487</span>
+<span id="488"> 488</span>
+<span id="489"> 489</span>
+<span id="490"> 490</span>
+<span id="491"> 491</span>
+<span id="492"> 492</span>
+<span id="493"> 493</span>
+<span id="494"> 494</span>
+<span id="495"> 495</span>
+<span id="496"> 496</span>
+<span id="497"> 497</span>
+<span id="498"> 498</span>
+<span id="499"> 499</span>
+<span id="500"> 500</span>
+<span id="501"> 501</span>
+<span id="502"> 502</span>
+<span id="503"> 503</span>
+<span id="504"> 504</span>
+<span id="505"> 505</span>
+<span id="506"> 506</span>
+<span id="507"> 507</span>
+<span id="508"> 508</span>
+<span id="509"> 509</span>
+<span id="510"> 510</span>
+<span id="511"> 511</span>
+<span id="512"> 512</span>
+<span id="513"> 513</span>
+<span id="514"> 514</span>
+<span id="515"> 515</span>
+<span id="516"> 516</span>
+<span id="517"> 517</span>
+<span id="518"> 518</span>
+<span id="519"> 519</span>
+<span id="520"> 520</span>
+<span id="521"> 521</span>
+<span id="522"> 522</span>
+<span id="523"> 523</span>
+<span id="524"> 524</span>
+<span id="525"> 525</span>
+<span id="526"> 526</span>
+<span id="527"> 527</span>
+<span id="528"> 528</span>
+<span id="529"> 529</span>
+<span id="530"> 530</span>
+<span id="531"> 531</span>
+<span id="532"> 532</span>
+<span id="533"> 533</span>
+<span id="534"> 534</span>
+<span id="535"> 535</span>
+<span id="536"> 536</span>
+<span id="537"> 537</span>
+<span id="538"> 538</span>
+<span id="539"> 539</span>
+<span id="540"> 540</span>
+<span id="541"> 541</span>
+<span id="542"> 542</span>
+<span id="543"> 543</span>
+<span id="544"> 544</span>
+<span id="545"> 545</span>
+<span id="546"> 546</span>
+<span id="547"> 547</span>
+<span id="548"> 548</span>
+<span id="549"> 549</span>
+<span id="550"> 550</span>
+<span id="551"> 551</span>
+<span id="552"> 552</span>
+<span id="553"> 553</span>
+<span id="554"> 554</span>
+<span id="555"> 555</span>
+<span id="556"> 556</span>
+<span id="557"> 557</span>
+<span id="558"> 558</span>
+<span id="559"> 559</span>
+<span id="560"> 560</span>
+<span id="561"> 561</span>
+<span id="562"> 562</span>
+<span id="563"> 563</span>
+<span id="564"> 564</span>
+<span id="565"> 565</span>
+<span id="566"> 566</span>
+<span id="567"> 567</span>
+<span id="568"> 568</span>
+<span id="569"> 569</span>
+<span id="570"> 570</span>
+<span id="571"> 571</span>
+<span id="572"> 572</span>
+<span id="573"> 573</span>
+<span id="574"> 574</span>
+<span id="575"> 575</span>
+<span id="576"> 576</span>
+<span id="577"> 577</span>
+<span id="578"> 578</span>
+<span id="579"> 579</span>
+<span id="580"> 580</span>
+<span id="581"> 581</span>
+<span id="582"> 582</span>
+<span id="583"> 583</span>
+<span id="584"> 584</span>
+<span id="585"> 585</span>
+<span id="586"> 586</span>
+<span id="587"> 587</span>
+<span id="588"> 588</span>
+<span id="589"> 589</span>
+<span id="590"> 590</span>
+<span id="591"> 591</span>
+<span id="592"> 592</span>
+<span id="593"> 593</span>
+<span id="594"> 594</span>
+<span id="595"> 595</span>
+<span id="596"> 596</span>
+<span id="597"> 597</span>
+<span id="598"> 598</span>
+<span id="599"> 599</span>
+<span id="600"> 600</span>
+<span id="601"> 601</span>
+<span id="602"> 602</span>
+<span id="603"> 603</span>
+<span id="604"> 604</span>
+<span id="605"> 605</span>
+<span id="606"> 606</span>
+<span id="607"> 607</span>
+<span id="608"> 608</span>
+<span id="609"> 609</span>
+<span id="610"> 610</span>
+<span id="611"> 611</span>
+<span id="612"> 612</span>
+<span id="613"> 613</span>
+<span id="614"> 614</span>
+<span id="615"> 615</span>
+<span id="616"> 616</span>
+<span id="617"> 617</span>
+<span id="618"> 618</span>
+<span id="619"> 619</span>
+<span id="620"> 620</span>
+<span id="621"> 621</span>
+<span id="622"> 622</span>
+<span id="623"> 623</span>
+<span id="624"> 624</span>
+<span id="625"> 625</span>
+<span id="626"> 626</span>
+<span id="627"> 627</span>
+<span id="628"> 628</span>
+<span id="629"> 629</span>
+<span id="630"> 630</span>
+<span id="631"> 631</span>
+<span id="632"> 632</span>
+<span id="633"> 633</span>
+<span id="634"> 634</span>
+<span id="635"> 635</span>
+<span id="636"> 636</span>
+<span id="637"> 637</span>
+<span id="638"> 638</span>
+<span id="639"> 639</span>
+<span id="640"> 640</span>
+<span id="641"> 641</span>
+<span id="642"> 642</span>
+<span id="643"> 643</span>
+<span id="644"> 644</span>
+<span id="645"> 645</span>
+<span id="646"> 646</span>
+<span id="647"> 647</span>
+<span id="648"> 648</span>
+<span id="649"> 649</span>
+<span id="650"> 650</span>
+<span id="651"> 651</span>
+<span id="652"> 652</span>
+<span id="653"> 653</span>
+<span id="654"> 654</span>
+<span id="655"> 655</span>
+<span id="656"> 656</span>
+<span id="657"> 657</span>
+<span id="658"> 658</span>
+<span id="659"> 659</span>
+<span id="660"> 660</span>
+<span id="661"> 661</span>
+<span id="662"> 662</span>
+<span id="663"> 663</span>
+<span id="664"> 664</span>
+<span id="665"> 665</span>
+<span id="666"> 666</span>
+<span id="667"> 667</span>
+<span id="668"> 668</span>
+<span id="669"> 669</span>
+<span id="670"> 670</span>
+<span id="671"> 671</span>
+<span id="672"> 672</span>
+<span id="673"> 673</span>
+<span id="674"> 674</span>
+<span id="675"> 675</span>
+<span id="676"> 676</span>
+<span id="677"> 677</span>
+<span id="678"> 678</span>
+<span id="679"> 679</span>
+<span id="680"> 680</span>
+<span id="681"> 681</span>
+<span id="682"> 682</span>
+<span id="683"> 683</span>
+<span id="684"> 684</span>
+<span id="685"> 685</span>
+<span id="686"> 686</span>
+<span id="687"> 687</span>
+<span id="688"> 688</span>
+<span id="689"> 689</span>
+<span id="690"> 690</span>
+<span id="691"> 691</span>
+<span id="692"> 692</span>
+<span id="693"> 693</span>
+<span id="694"> 694</span>
+<span id="695"> 695</span>
+<span id="696"> 696</span>
+<span id="697"> 697</span>
+<span id="698"> 698</span>
+<span id="699"> 699</span>
+<span id="700"> 700</span>
+<span id="701"> 701</span>
+<span id="702"> 702</span>
+<span id="703"> 703</span>
+<span id="704"> 704</span>
+<span id="705"> 705</span>
+<span id="706"> 706</span>
+<span id="707"> 707</span>
+<span id="708"> 708</span>
+<span id="709"> 709</span>
+<span id="710"> 710</span>
+<span id="711"> 711</span>
+<span id="712"> 712</span>
+<span id="713"> 713</span>
+<span id="714"> 714</span>
+<span id="715"> 715</span>
+<span id="716"> 716</span>
+<span id="717"> 717</span>
+<span id="718"> 718</span>
+<span id="719"> 719</span>
+<span id="720"> 720</span>
+<span id="721"> 721</span>
+<span id="722"> 722</span>
+<span id="723"> 723</span>
+<span id="724"> 724</span>
+<span id="725"> 725</span>
+<span id="726"> 726</span>
+<span id="727"> 727</span>
+<span id="728"> 728</span>
+<span id="729"> 729</span>
+<span id="730"> 730</span>
+<span id="731"> 731</span>
+<span id="732"> 732</span>
+<span id="733"> 733</span>
+<span id="734"> 734</span>
+<span id="735"> 735</span>
+<span id="736"> 736</span>
+<span id="737"> 737</span>
+<span id="738"> 738</span>
+<span id="739"> 739</span>
+<span id="740"> 740</span>
+<span id="741"> 741</span>
+<span id="742"> 742</span>
+<span id="743"> 743</span>
+<span id="744"> 744</span>
+<span id="745"> 745</span>
+<span id="746"> 746</span>
+<span id="747"> 747</span>
+<span id="748"> 748</span>
+<span id="749"> 749</span>
+<span id="750"> 750</span>
+<span id="751"> 751</span>
+<span id="752"> 752</span>
+<span id="753"> 753</span>
+<span id="754"> 754</span>
+<span id="755"> 755</span>
+<span id="756"> 756</span>
+<span id="757"> 757</span>
+<span id="758"> 758</span>
+<span id="759"> 759</span>
+<span id="760"> 760</span>
+<span id="761"> 761</span>
+<span id="762"> 762</span>
+<span id="763"> 763</span>
+<span id="764"> 764</span>
+<span id="765"> 765</span>
+<span id="766"> 766</span>
+<span id="767"> 767</span>
+<span id="768"> 768</span>
+<span id="769"> 769</span>
+<span id="770"> 770</span>
+<span id="771"> 771</span>
+<span id="772"> 772</span>
+<span id="773"> 773</span>
+<span id="774"> 774</span>
+<span id="775"> 775</span>
+<span id="776"> 776</span>
+<span id="777"> 777</span>
+<span id="778"> 778</span>
+<span id="779"> 779</span>
+<span id="780"> 780</span>
+<span id="781"> 781</span>
+<span id="782"> 782</span>
+<span id="783"> 783</span>
+<span id="784"> 784</span>
+<span id="785"> 785</span>
+<span id="786"> 786</span>
+<span id="787"> 787</span>
+<span id="788"> 788</span>
+<span id="789"> 789</span>
+<span id="790"> 790</span>
+<span id="791"> 791</span>
+<span id="792"> 792</span>
+<span id="793"> 793</span>
+<span id="794"> 794</span>
+<span id="795"> 795</span>
+<span id="796"> 796</span>
+<span id="797"> 797</span>
+<span id="798"> 798</span>
+<span id="799"> 799</span>
+<span id="800"> 800</span>
+<span id="801"> 801</span>
+<span id="802"> 802</span>
+<span id="803"> 803</span>
+<span id="804"> 804</span>
+<span id="805"> 805</span>
+<span id="806"> 806</span>
+<span id="807"> 807</span>
+<span id="808"> 808</span>
+<span id="809"> 809</span>
+<span id="810"> 810</span>
+<span id="811"> 811</span>
+<span id="812"> 812</span>
+<span id="813"> 813</span>
+<span id="814"> 814</span>
+<span id="815"> 815</span>
+<span id="816"> 816</span>
+<span id="817"> 817</span>
+<span id="818"> 818</span>
+<span id="819"> 819</span>
+<span id="820"> 820</span>
+<span id="821"> 821</span>
+<span id="822"> 822</span>
+<span id="823"> 823</span>
+<span id="824"> 824</span>
+<span id="825"> 825</span>
+<span id="826"> 826</span>
+<span id="827"> 827</span>
+<span id="828"> 828</span>
+<span id="829"> 829</span>
+<span id="830"> 830</span>
+<span id="831"> 831</span>
+<span id="832"> 832</span>
+<span id="833"> 833</span>
+<span id="834"> 834</span>
+<span id="835"> 835</span>
+<span id="836"> 836</span>
+<span id="837"> 837</span>
+<span id="838"> 838</span>
+<span id="839"> 839</span>
+<span id="840"> 840</span>
+<span id="841"> 841</span>
+<span id="842"> 842</span>
+<span id="843"> 843</span>
+<span id="844"> 844</span>
+<span id="845"> 845</span>
+<span id="846"> 846</span>
+<span id="847"> 847</span>
+<span id="848"> 848</span>
+<span id="849"> 849</span>
+<span id="850"> 850</span>
+<span id="851"> 851</span>
+<span id="852"> 852</span>
+<span id="853"> 853</span>
+<span id="854"> 854</span>
+<span id="855"> 855</span>
+<span id="856"> 856</span>
+<span id="857"> 857</span>
+<span id="858"> 858</span>
+<span id="859"> 859</span>
+<span id="860"> 860</span>
+<span id="861"> 861</span>
+<span id="862"> 862</span>
+<span id="863"> 863</span>
+<span id="864"> 864</span>
+<span id="865"> 865</span>
+<span id="866"> 866</span>
+<span id="867"> 867</span>
+<span id="868"> 868</span>
+<span id="869"> 869</span>
+<span id="870"> 870</span>
+<span id="871"> 871</span>
+<span id="872"> 872</span>
+<span id="873"> 873</span>
+<span id="874"> 874</span>
+<span id="875"> 875</span>
+<span id="876"> 876</span>
+<span id="877"> 877</span>
+<span id="878"> 878</span>
+<span id="879"> 879</span>
+<span id="880"> 880</span>
+<span id="881"> 881</span>
+<span id="882"> 882</span>
+<span id="883"> 883</span>
+<span id="884"> 884</span>
+<span id="885"> 885</span>
+<span id="886"> 886</span>
+<span id="887"> 887</span>
+<span id="888"> 888</span>
+<span id="889"> 889</span>
+<span id="890"> 890</span>
+<span id="891"> 891</span>
+<span id="892"> 892</span>
+<span id="893"> 893</span>
+<span id="894"> 894</span>
+<span id="895"> 895</span>
+<span id="896"> 896</span>
+<span id="897"> 897</span>
+<span id="898"> 898</span>
+<span id="899"> 899</span>
+<span id="900"> 900</span>
+<span id="901"> 901</span>
+<span id="902"> 902</span>
+<span id="903"> 903</span>
+<span id="904"> 904</span>
+<span id="905"> 905</span>
+<span id="906"> 906</span>
+<span id="907"> 907</span>
+<span id="908"> 908</span>
+<span id="909"> 909</span>
+<span id="910"> 910</span>
+<span id="911"> 911</span>
+<span id="912"> 912</span>
+<span id="913"> 913</span>
+<span id="914"> 914</span>
+<span id="915"> 915</span>
+<span id="916"> 916</span>
+<span id="917"> 917</span>
+<span id="918"> 918</span>
+<span id="919"> 919</span>
+<span id="920"> 920</span>
+<span id="921"> 921</span>
+<span id="922"> 922</span>
+<span id="923"> 923</span>
+<span id="924"> 924</span>
+<span id="925"> 925</span>
+<span id="926"> 926</span>
+<span id="927"> 927</span>
+<span id="928"> 928</span>
+<span id="929"> 929</span>
+<span id="930"> 930</span>
+<span id="931"> 931</span>
+<span id="932"> 932</span>
+<span id="933"> 933</span>
+<span id="934"> 934</span>
+<span id="935"> 935</span>
+<span id="936"> 936</span>
+<span id="937"> 937</span>
+<span id="938"> 938</span>
+<span id="939"> 939</span>
+<span id="940"> 940</span>
+<span id="941"> 941</span>
+<span id="942"> 942</span>
+<span id="943"> 943</span>
+<span id="944"> 944</span>
+<span id="945"> 945</span>
+<span id="946"> 946</span>
+<span id="947"> 947</span>
+<span id="948"> 948</span>
+<span id="949"> 949</span>
+<span id="950"> 950</span>
+<span id="951"> 951</span>
+<span id="952"> 952</span>
+<span id="953"> 953</span>
+<span id="954"> 954</span>
+<span id="955"> 955</span>
+<span id="956"> 956</span>
+<span id="957"> 957</span>
+<span id="958"> 958</span>
+<span id="959"> 959</span>
+<span id="960"> 960</span>
+<span id="961"> 961</span>
+<span id="962"> 962</span>
+<span id="963"> 963</span>
+<span id="964"> 964</span>
+<span id="965"> 965</span>
+<span id="966"> 966</span>
+<span id="967"> 967</span>
+<span id="968"> 968</span>
+<span id="969"> 969</span>
+<span id="970"> 970</span>
+<span id="971"> 971</span>
+<span id="972"> 972</span>
+<span id="973"> 973</span>
+<span id="974"> 974</span>
+<span id="975"> 975</span>
+<span id="976"> 976</span>
+<span id="977"> 977</span>
+<span id="978"> 978</span>
+<span id="979"> 979</span>
+<span id="980"> 980</span>
+<span id="981"> 981</span>
+<span id="982"> 982</span>
+<span id="983"> 983</span>
+<span id="984"> 984</span>
+<span id="985"> 985</span>
+<span id="986"> 986</span>
+<span id="987"> 987</span>
+<span id="988"> 988</span>
+<span id="989"> 989</span>
+<span id="990"> 990</span>
+<span id="991"> 991</span>
+<span id="992"> 992</span>
+<span id="993"> 993</span>
+<span id="994"> 994</span>
+<span id="995"> 995</span>
+<span id="996"> 996</span>
+<span id="997"> 997</span>
+<span id="998"> 998</span>
+<span id="999"> 999</span>
+<span id="1000">1000</span>
+<span id="1001">1001</span>
+<span id="1002">1002</span>
+<span id="1003">1003</span>
+<span id="1004">1004</span>
+<span id="1005">1005</span>
+<span id="1006">1006</span>
+<span id="1007">1007</span>
+<span id="1008">1008</span>
+<span id="1009">1009</span>
+<span id="1010">1010</span>
+<span id="1011">1011</span>
+<span id="1012">1012</span>
+<span id="1013">1013</span>
+<span id="1014">1014</span>
+<span id="1015">1015</span>
+<span id="1016">1016</span>
+<span id="1017">1017</span>
+<span id="1018">1018</span>
+<span id="1019">1019</span>
+<span id="1020">1020</span>
+<span id="1021">1021</span>
+<span id="1022">1022</span>
+<span id="1023">1023</span>
+<span id="1024">1024</span>
+<span id="1025">1025</span>
+<span id="1026">1026</span>
+<span id="1027">1027</span>
+<span id="1028">1028</span>
+<span id="1029">1029</span>
+<span id="1030">1030</span>
+<span id="1031">1031</span>
+<span id="1032">1032</span>
+<span id="1033">1033</span>
+<span id="1034">1034</span>
+<span id="1035">1035</span>
+<span id="1036">1036</span>
+<span id="1037">1037</span>
+<span id="1038">1038</span>
+<span id="1039">1039</span>
+<span id="1040">1040</span>
+<span id="1041">1041</span>
+<span id="1042">1042</span>
+<span id="1043">1043</span>
+<span id="1044">1044</span>
+<span id="1045">1045</span>
+<span id="1046">1046</span>
+<span id="1047">1047</span>
+<span id="1048">1048</span>
+<span id="1049">1049</span>
+<span id="1050">1050</span>
+<span id="1051">1051</span>
+<span id="1052">1052</span>
+<span id="1053">1053</span>
+<span id="1054">1054</span>
+<span id="1055">1055</span>
+<span id="1056">1056</span>
+<span id="1057">1057</span>
+<span id="1058">1058</span>
+<span id="1059">1059</span>
+<span id="1060">1060</span>
+<span id="1061">1061</span>
+<span id="1062">1062</span>
+<span id="1063">1063</span>
+<span id="1064">1064</span>
+<span id="1065">1065</span>
+<span id="1066">1066</span>
+<span id="1067">1067</span>
+<span id="1068">1068</span>
+<span id="1069">1069</span>
+<span id="1070">1070</span>
+<span id="1071">1071</span>
+<span id="1072">1072</span>
+<span id="1073">1073</span>
+<span id="1074">1074</span>
+<span id="1075">1075</span>
+<span id="1076">1076</span>
+<span id="1077">1077</span>
+<span id="1078">1078</span>
+<span id="1079">1079</span>
+<span id="1080">1080</span>
+<span id="1081">1081</span>
+<span id="1082">1082</span>
+<span id="1083">1083</span>
+<span id="1084">1084</span>
+<span id="1085">1085</span>
+<span id="1086">1086</span>
+<span id="1087">1087</span>
+<span id="1088">1088</span>
+<span id="1089">1089</span>
+<span id="1090">1090</span>
+<span id="1091">1091</span>
+<span id="1092">1092</span>
+<span id="1093">1093</span>
+<span id="1094">1094</span>
+<span id="1095">1095</span>
+<span id="1096">1096</span>
+<span id="1097">1097</span>
+<span id="1098">1098</span>
+<span id="1099">1099</span>
+<span id="1100">1100</span>
+<span id="1101">1101</span>
+<span id="1102">1102</span>
+<span id="1103">1103</span>
+<span id="1104">1104</span>
+<span id="1105">1105</span>
+<span id="1106">1106</span>
+<span id="1107">1107</span>
+<span id="1108">1108</span>
+<span id="1109">1109</span>
+<span id="1110">1110</span>
+<span id="1111">1111</span>
+<span id="1112">1112</span>
+<span id="1113">1113</span>
+<span id="1114">1114</span>
+<span id="1115">1115</span>
+<span id="1116">1116</span>
+<span id="1117">1117</span>
+<span id="1118">1118</span>
+<span id="1119">1119</span>
+<span id="1120">1120</span>
+<span id="1121">1121</span>
+<span id="1122">1122</span>
+<span id="1123">1123</span>
+<span id="1124">1124</span>
+<span id="1125">1125</span>
+<span id="1126">1126</span>
+<span id="1127">1127</span>
+<span id="1128">1128</span>
+<span id="1129">1129</span>
+<span id="1130">1130</span>
+<span id="1131">1131</span>
+<span id="1132">1132</span>
+<span id="1133">1133</span>
+<span id="1134">1134</span>
+<span id="1135">1135</span>
+<span id="1136">1136</span>
+<span id="1137">1137</span>
+<span id="1138">1138</span>
+<span id="1139">1139</span>
+<span id="1140">1140</span>
+<span id="1141">1141</span>
+<span id="1142">1142</span>
+<span id="1143">1143</span>
+<span id="1144">1144</span>
+<span id="1145">1145</span>
+<span id="1146">1146</span>
+<span id="1147">1147</span>
+<span id="1148">1148</span>
+<span id="1149">1149</span>
+<span id="1150">1150</span>
+<span id="1151">1151</span>
+<span id="1152">1152</span>
+<span id="1153">1153</span>
+<span id="1154">1154</span>
+<span id="1155">1155</span>
+<span id="1156">1156</span>
+<span id="1157">1157</span>
+<span id="1158">1158</span>
+<span id="1159">1159</span>
+<span id="1160">1160</span>
+<span id="1161">1161</span>
+<span id="1162">1162</span>
+<span id="1163">1163</span>
+<span id="1164">1164</span>
+<span id="1165">1165</span>
+<span id="1166">1166</span>
+<span id="1167">1167</span>
+<span id="1168">1168</span>
+<span id="1169">1169</span>
+<span id="1170">1170</span>
+<span id="1171">1171</span>
+<span id="1172">1172</span>
+<span id="1173">1173</span>
+<span id="1174">1174</span>
+<span id="1175">1175</span>
+<span id="1176">1176</span>
+<span id="1177">1177</span>
+<span id="1178">1178</span>
+<span id="1179">1179</span>
+<span id="1180">1180</span>
+<span id="1181">1181</span>
+<span id="1182">1182</span>
+<span id="1183">1183</span>
+<span id="1184">1184</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
+<span class='comment'>// file at the top-level directory of this distribution and at</span>
+<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
+<span class='comment'>//</span>
+<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
+<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
+<span class='comment'>// except according to those terms.</span>
+
+<span class='doccomment'>/*!
+This crate provides a regular expression parser and an abstract syntax for
+regular expressions. The abstract syntax is defined by the `Expr` type. The
+concrete syntax is enumerated in the
+[`regex`](../regex/index.html#syntax)
+crate documentation.
+
+Note that since this crate is first and foremost an implementation detail for
+the `regex` crate, it may experience more frequent breaking changes. It is
+exposed as a separate crate so that others may use it to do analysis on regular
+expressions or even build their own matching engine.
+
+# Example: parsing an expression
+
+Parsing a regular expression can be done with the `Expr::parse` function.
+
+```rust
+use regex_syntax::Expr;
+
+assert_eq!(Expr::parse(r&quot;ab|yz&quot;).unwrap(), Expr::Alternate(vec![
+    Expr::Literal { chars: vec![&#39;a&#39;, &#39;b&#39;], casei: false },
+    Expr::Literal { chars: vec![&#39;y&#39;, &#39;z&#39;], casei: false },
+]));
+```
+
+# Example: inspecting an error
+
+The parser in this crate provides very detailed error values. For example,
+if an invalid character class range is given:
+
+```rust
+use regex_syntax::{Expr, ErrorKind};
+
+let err = Expr::parse(r&quot;[z-a]&quot;).unwrap_err();
+assert_eq!(err.position(), 4);
+assert_eq!(err.kind(), &amp;ErrorKind::InvalidClassRange {
+    start: &#39;z&#39;,
+    end: &#39;a&#39;,
+});
+```
+
+Or unbalanced parentheses:
+
+```rust
+use regex_syntax::{Expr, ErrorKind};
+
+let err = Expr::parse(r&quot;ab(cd&quot;).unwrap_err();
+assert_eq!(err.position(), 2);
+assert_eq!(err.kind(), &amp;ErrorKind::UnclosedParen);
+```
+*/</span>
+
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>deny</span>(<span class='ident'>missing_docs</span>)]</span>
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>quickcheck</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>rand</span>;
+
+<span class='kw'>mod</span> <span class='ident'>parser</span>;
+<span class='kw'>mod</span> <span class='ident'>unicode</span>;
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::{<span class='ident'>Ordering</span>, <span class='ident'>max</span>, <span class='ident'>min</span>};
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>IntoIterator</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>slice</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>vec</span>;
+
+<span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>case_folding</span>;
+
+<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Expr</span>::<span class='op'>*</span>;
+<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Repeater</span>::<span class='op'>*</span>;
+
+<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>;
+
+<span class='doccomment'>/// A regular expression abstract syntax tree.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// An `Expr` represents the abstract syntax of a regular expression.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Expr</span> {
+    <span class='doccomment'>/// An empty regex (which never matches any text).</span>
+    <span class='ident'>Empty</span>,
+    <span class='doccomment'>/// A sequence of one or more literal characters to be matched.</span>
+    <span class='ident'>Literal</span> {
+        <span class='doccomment'>/// The characters.</span>
+        <span class='ident'>chars</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// Whether to match case insensitively.</span>
+        <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+    },
+    <span class='doccomment'>/// Match any character, excluding new line.</span>
+    <span class='ident'>AnyChar</span>,
+    <span class='doccomment'>/// Match any character.</span>
+    <span class='ident'>AnyCharNoNL</span>,
+    <span class='doccomment'>/// A character class.</span>
+    <span class='ident'>Class</span>(<span class='ident'>CharClass</span>),
+    <span class='doccomment'>/// Match the start of a line or beginning of input.</span>
+    <span class='ident'>StartLine</span>,
+    <span class='doccomment'>/// Match the end of a line or end of input.</span>
+    <span class='ident'>EndLine</span>,
+    <span class='doccomment'>/// Match the beginning of input.</span>
+    <span class='ident'>StartText</span>,
+    <span class='doccomment'>/// Match the end of input.</span>
+    <span class='ident'>EndText</span>,
+    <span class='doccomment'>/// Match a word boundary (word character on one side and a non-word</span>
+    <span class='doccomment'>/// character on the other).</span>
+    <span class='ident'>WordBoundary</span>,
+    <span class='doccomment'>/// Match a position that is not a word boundary (word or non-word</span>
+    <span class='doccomment'>/// characters on both sides).</span>
+    <span class='ident'>NotWordBoundary</span>,
+    <span class='doccomment'>/// A group, possibly non-capturing.</span>
+    <span class='ident'>Group</span> {
+        <span class='doccomment'>/// The expression inside the group.</span>
+        <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// The capture index (starting at `1`) only for capturing groups.</span>
+        <span class='ident'>i</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// The capture name, only for capturing named groups.</span>
+        <span class='ident'>name</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>,
+    },
+    <span class='doccomment'>/// A repeat operator (`?`, `*`, `+` or `{m,n}`).</span>
+    <span class='ident'>Repeat</span> {
+        <span class='doccomment'>/// The expression to be repeated. Limited to literals, `.`, classes</span>
+        <span class='doccomment'>/// or grouped expressions.</span>
+        <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// The type of repeat operator used.</span>
+        <span class='ident'>r</span>: <span class='ident'>Repeater</span>,
+        <span class='doccomment'>/// Whether the repeat is greedy (match the most) or not (match the</span>
+        <span class='doccomment'>/// least).</span>
+        <span class='ident'>greedy</span>: <span class='ident'>bool</span>,
+    },
+    <span class='doccomment'>/// A concatenation of expressions. Must be matched one after the other.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// N.B. A concat expression can only appear at the top-level or</span>
+    <span class='doccomment'>/// immediately inside a group expression.</span>
+    <span class='ident'>Concat</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>),
+    <span class='doccomment'>/// An alternation of expressions. Only one must match.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// N.B. An alternate expression can only appear at the top-level or</span>
+    <span class='doccomment'>/// immediately inside a group expression.</span>
+    <span class='ident'>Alternate</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>),
+}
+
+<span class='kw'>type</span> <span class='ident'>CaptureIndex</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>;
+
+<span class='kw'>type</span> <span class='ident'>CaptureName</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// The type of a repeat operator expression.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Repeater</span> {
+    <span class='doccomment'>/// Match zero or one (`?`).</span>
+    <span class='ident'>ZeroOrOne</span>,
+    <span class='doccomment'>/// Match zero or more (`*`).</span>
+    <span class='ident'>ZeroOrMore</span>,
+    <span class='doccomment'>/// Match one or more (`+`).</span>
+    <span class='ident'>OneOrMore</span>,
+    <span class='doccomment'>/// Match for at least `min` and at most `max` (`{m,n}`).</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// When `max` is `None`, there is no upper bound on the number of matches.</span>
+    <span class='ident'>Range</span> {
+        <span class='doccomment'>/// Lower bound on the number of matches.</span>
+        <span class='ident'>min</span>: <span class='ident'>u32</span>,
+        <span class='doccomment'>/// Optional upper bound on the number of matches.</span>
+        <span class='ident'>max</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span>,
+    },
+}
+
+<span class='doccomment'>/// A character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// A character class has a canonical format that the parser guarantees. Its</span>
+<span class='doccomment'>/// canonical format is defined by the following invariants:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// 1. Given any Unicode scalar value, it is matched by *at most* one character</span>
+<span class='doccomment'>///    range in a canonical character class.</span>
+<span class='doccomment'>/// 2. Every adjacent character range is separated by at least one Unicode</span>
+<span class='doccomment'>///    scalar value.</span>
+<span class='doccomment'>/// 3. Given any pair of character ranges `r1` and `r2`, if</span>
+<span class='doccomment'>///    `r1.end &lt; r2.start`, then `r1` comes before `r2` in a canonical</span>
+<span class='doccomment'>///    character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// In sum, any `CharClass` produced by this crate&#39;s parser is a sorted</span>
+<span class='doccomment'>/// sequence of non-overlapping ranges. This makes it possible to test whether</span>
+<span class='doccomment'>/// a character is matched by a class with a binary search.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Additionally, a character class may be marked *case insensitive*. If it&#39;s</span>
+<span class='doccomment'>/// case insensitive, then:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// 1. Simple case folding has been applied to all ranges.</span>
+<span class='doccomment'>/// 2. Simple case folding must be applied to a character before testing</span>
+<span class='doccomment'>///    whether it matches the character class.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>CharClass</span> {
+    <span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>,
+    <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+}
+
+<span class='doccomment'>/// A single inclusive range in a character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Since range boundaries are defined by Unicode scalar values, the boundaries</span>
+<span class='doccomment'>/// can never be in the open interval `(0xD7FF, 0xE000)`. However, a range may</span>
+<span class='doccomment'>/// *cover* codepoints that are not scalar values.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Note that this has a few convenient impls on `PartialEq` and `PartialOrd`</span>
+<span class='doccomment'>/// for testing whether a character is contained inside a given range.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>PartialOrd</span>, <span class='ident'>Eq</span>, <span class='ident'>Ord</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ClassRange</span> {
+    <span class='doccomment'>/// The start character of the range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This must be less than or equal to `end`.</span>
+    <span class='kw'>pub</span> <span class='ident'>start</span>: <span class='ident'>char</span>,
+
+    <span class='doccomment'>/// The end character of the range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This must be greater than or equal to `end`.</span>
+    <span class='kw'>pub</span> <span class='ident'>end</span>: <span class='ident'>char</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Expr</span> {
+    <span class='doccomment'>/// Parses a string in a regular expression syntax tree.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='ident'>parser</span>::<span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='ident'>s</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>())
+    }
+
+    <span class='doccomment'>/// Returns true iff the expression can be repeated by a quantifier.</span>
+    <span class='kw'>fn</span> <span class='ident'>can_repeat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>Literal</span>{..}
+            <span class='op'>|</span> <span class='ident'>AnyChar</span>
+            <span class='op'>|</span> <span class='ident'>AnyCharNoNL</span>
+            <span class='op'>|</span> <span class='ident'>Class</span>(_)
+            <span class='op'>|</span> <span class='ident'>StartLine</span> <span class='op'>|</span> <span class='ident'>EndLine</span> <span class='op'>|</span> <span class='ident'>StartText</span> <span class='op'>|</span> <span class='ident'>EndText</span>
+            <span class='op'>|</span> <span class='ident'>WordBoundary</span> <span class='op'>|</span> <span class='ident'>NotWordBoundary</span>
+            <span class='op'>|</span> <span class='ident'>Group</span>{..}
+            <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+            _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>simplify</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> {
+        <span class='kw'>fn</span> <span class='ident'>combine_literals</span>(<span class='ident'>es</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>, <span class='ident'>e</span>: <span class='ident'>Expr</span>) {
+            <span class='kw'>match</span> (<span class='ident'>es</span>.<span class='ident'>pop</span>(), <span class='ident'>e</span>) {
+                (<span class='prelude-val'>None</span>, <span class='ident'>e</span>) <span class='op'>=&gt;</span> <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e</span>),
+                (<span class='prelude-val'>Some</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='kw-2'>mut</span> <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> }),
+                 <span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> }) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>casei1</span> <span class='op'>==</span> <span class='ident'>casei2</span> {
+                        <span class='ident'>chars1</span>.<span class='ident'>extend</span>(<span class='ident'>chars2</span>);
+                        <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> });
+                    } <span class='kw'>else</span> {
+                        <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> });
+                        <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> });
+                    }
+                }
+                (<span class='prelude-val'>Some</span>(<span class='ident'>e1</span>), <span class='ident'>e2</span>) <span class='op'>=&gt;</span> {
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e1</span>);
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e2</span>);
+                }
+            }
+        }
+        <span class='kw'>match</span> <span class='self'>self</span> {
+            <span class='ident'>Repeat</span> { <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=&gt;</span> <span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>.<span class='ident'>simplify</span>()),
+                <span class='ident'>r</span>: <span class='ident'>r</span>,
+                <span class='ident'>greedy</span>: <span class='ident'>greedy</span>,
+            },
+            <span class='ident'>Group</span> { <span class='ident'>e</span>, <span class='ident'>i</span>, <span class='ident'>name</span> } <span class='op'>=&gt;</span> {
+                <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>();
+                <span class='kw'>if</span> <span class='ident'>i</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>name</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+                    <span class='ident'>e</span>
+                } <span class='kw'>else</span> {
+                    <span class='ident'>Group</span> { <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>), <span class='ident'>i</span>: <span class='ident'>i</span>, <span class='ident'>name</span>: <span class='ident'>name</span> }
+                }
+            }
+            <span class='ident'>Concat</span>(<span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+                <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_es</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>es</span>.<span class='ident'>len</span>());
+                <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> {
+                    <span class='ident'>combine_literals</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>new_es</span>, <span class='ident'>e</span>.<span class='ident'>simplify</span>());
+                }
+                <span class='kw'>if</span> <span class='ident'>new_es</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span> {
+                    <span class='ident'>new_es</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>()
+                } <span class='kw'>else</span> {
+                    <span class='ident'>Concat</span>(<span class='ident'>new_es</span>)
+                }
+            }
+            <span class='ident'>Alternate</span>(<span class='ident'>es</span>) <span class='op'>=&gt;</span> <span class='ident'>Alternate</span>(<span class='ident'>es</span>.<span class='ident'>into_iter</span>()
+                                         .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>())
+                                         .<span class='ident'>collect</span>()),
+            <span class='ident'>e</span> <span class='op'>=&gt;</span> <span class='ident'>e</span>,
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>ranges</span> }
+}
+
+<span class='kw'>impl</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>ClassRange</span>;
+    <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>into_iter</span>() }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>ClassRange</span>;
+    <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>iter</span>() }
+}
+
+<span class='kw'>impl</span> <span class='ident'>CharClass</span> {
+    <span class='doccomment'>/// Create a new class from an existing set of ranges.</span>
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>ranges</span>, <span class='ident'>casei</span>: <span class='boolval'>false</span> }
+    }
+
+    <span class='doccomment'>/// Create an empty class.</span>
+    <span class='kw'>fn</span> <span class='ident'>empty</span>() <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>Vec</span>::<span class='ident'>new</span>())
+    }
+
+    <span class='doccomment'>/// Returns true if `c` is matched by this character class.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// If this character class is case insensitive, then simple case folding</span>
+    <span class='doccomment'>/// is applied to `c` before checking for a match.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>matches</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='kw-2'>mut</span> <span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_case_insensitive</span>() {
+            <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>)
+        }
+        <span class='self'>self</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='ident'>range</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>partial_cmp</span>(<span class='ident'>range</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>()
+    }
+
+    <span class='doccomment'>/// Returns true if this character class should be matched case</span>
+    <span class='doccomment'>/// insensitively.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// When `true`, simple case folding has already been applied to the</span>
+    <span class='doccomment'>/// class.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_case_insensitive</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='self'>self</span>.<span class='ident'>casei</span>
+    }
+
+    <span class='doccomment'>/// Create a new empty class from this one.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Namely, its capacity and case insensitive setting will be the same.</span>
+    <span class='kw'>fn</span> <span class='ident'>to_empty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='self'>self</span>.<span class='ident'>len</span>()), <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>casei</span> }
+    }
+
+    <span class='doccomment'>/// Merge two classes and canonicalize them.</span>
+    <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+    <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>CharClass</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>other</span>);
+        <span class='self'>self</span>.<span class='ident'>canonicalize</span>()
+    }
+
+    <span class='doccomment'>/// Canonicalze any sequence of ranges.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This is responsible for enforcing the canonical format invariants</span>
+    <span class='doccomment'>/// as described on the docs for the `CharClass` type.</span>
+    <span class='kw'>fn</span> <span class='ident'>canonicalize</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='comment'>// TODO: Save some cycles here by checking if already canonicalized.</span>
+        <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>sort</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ordered</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>(); <span class='comment'>// TODO: Do this in place?</span>
+        <span class='kw'>for</span> <span class='ident'>candidate</span> <span class='kw'>in</span> <span class='self'>self</span> {
+            <span class='comment'>// If the candidate overlaps with an existing range, then it must</span>
+            <span class='comment'>// be the most recent range added because we process the candidates</span>
+            <span class='comment'>// in order.</span>
+            <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>or</span>) <span class='op'>=</span> <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>last_mut</span>() {
+                <span class='kw'>if</span> <span class='ident'>or</span>.<span class='ident'>overlapping</span>(<span class='ident'>candidate</span>) {
+                    <span class='op'>*</span><span class='ident'>or</span> <span class='op'>=</span> <span class='ident'>or</span>.<span class='ident'>merge</span>(<span class='ident'>candidate</span>);
+                    <span class='kw'>continue</span>;
+                }
+            }
+            <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>candidate</span>);
+        }
+        <span class='ident'>ordered</span>
+    }
+
+    <span class='doccomment'>/// Negates the character class.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// For all `c` where `c` is a Unicode scalar value, `c` matches `self`</span>
+    <span class='doccomment'>/// if and only if `c` does not match `self.negate()`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Note that this cannot be called on a character class that has had</span>
+    <span class='doccomment'>/// case folding applied to it. (Because case folding turns on a flag</span>
+    <span class='doccomment'>/// and doesn&#39;t store every possible matching character. Therefore,</span>
+    <span class='doccomment'>/// its negation is tricky to get right. Turns out, we don&#39;t need it</span>
+    <span class='doccomment'>/// anyway!)</span>
+    <span class='kw'>fn</span> <span class='ident'>negate</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>fn</span> <span class='ident'>range</span>(<span class='ident'>s</span>: <span class='ident'>char</span>, <span class='ident'>e</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> { <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>s</span>, <span class='ident'>e</span>) }
+
+        <span class='comment'>// Never allow negating of a class that has been case folded!</span>
+        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='self'>self</span>.<span class='ident'>casei</span>);
+
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_empty</span>() { <span class='kw'>return</span> <span class='self'>self</span>; }
+        <span class='self'>self</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>canonicalize</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inv</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span> <span class='op'>&gt;</span> <span class='string'>&#39;\x00&#39;</span> {
+            <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='string'>&#39;\x00&#39;</span>, <span class='ident'>dec_char</span>(<span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span>)));
+        }
+        <span class='kw'>for</span> <span class='ident'>win</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>windows</span>(<span class='number'>2</span>) {
+            <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='ident'>win</span>[<span class='number'>0</span>].<span class='ident'>end</span>),
+                                  <span class='ident'>dec_char</span>(<span class='ident'>win</span>[<span class='number'>1</span>].<span class='ident'>start</span>)));
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span> <span class='op'>&lt;</span> <span class='ident'>char</span>::<span class='ident'>MAX</span> {
+            <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span>),
+                                  <span class='ident'>char</span>::<span class='ident'>MAX</span>));
+        }
+        <span class='ident'>inv</span>
+    }
+
+    <span class='doccomment'>/// Apply case folding to this character class.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// One a class had been case folded, it cannot be negated.</span>
+    <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>folded</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>();
+        <span class='ident'>folded</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+        <span class='kw'>for</span> <span class='ident'>r</span> <span class='kw'>in</span> <span class='self'>self</span> {
+            <span class='comment'>// Applying case folding to a range is expensive because *every*</span>
+            <span class='comment'>// character needed to be examined. Thus, we avoid that drudgery</span>
+            <span class='comment'>// if no character in the current range is in our case folding</span>
+            <span class='comment'>// table.</span>
+            <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>needs_case_folding</span>() {
+                <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>r</span>.<span class='ident'>case_fold</span>());
+            } <span class='kw'>else</span> {
+                <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>r</span>);
+            }
+        }
+        <span class='ident'>folded</span>.<span class='ident'>canonicalize</span>()
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>ClassRange</span> {
+    <span class='doccomment'>/// Create a new class range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// If `end &lt; start`, then the two values are swapped so that</span>
+    <span class='doccomment'>/// the invariant `start &lt;= end` is preserved.</span>
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>start</span>: <span class='ident'>char</span>, <span class='ident'>end</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+        <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>&lt;=</span> <span class='ident'>end</span> {
+            <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>start</span>, <span class='ident'>end</span>: <span class='ident'>end</span> }
+        } <span class='kw'>else</span> {
+            <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>end</span>, <span class='ident'>end</span>: <span class='ident'>start</span> }
+        }
+    }
+
+    <span class='doccomment'>/// Create a range of one character.</span>
+    <span class='kw'>fn</span> <span class='ident'>one</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+        <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>c</span>, <span class='ident'>end</span>: <span class='ident'>c</span> }
+    }
+
+    <span class='doccomment'>/// Returns true if and only if the two ranges are overlapping. Note that</span>
+    <span class='doccomment'>/// since ranges are inclusive, `a-c` and `d-f` are overlapping!</span>
+    <span class='kw'>fn</span> <span class='ident'>overlapping</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>) <span class='op'>&lt;=</span> <span class='ident'>inc_char</span>(<span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>))
+    }
+
+    <span class='doccomment'>/// Creates a new range representing the union of `self` and `other.</span>
+    <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+        <span class='ident'>ClassRange</span> {
+            <span class='ident'>start</span>: <span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>),
+            <span class='ident'>end</span>: <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>),
+        }
+    }
+
+    <span class='doccomment'>/// Returns true if and only if this range contains a character that is</span>
+    <span class='doccomment'>/// in the case folding table.</span>
+    <span class='kw'>fn</span> <span class='ident'>needs_case_folding</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>
+        .<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>c</span>, _)<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>()
+    }
+
+    <span class='doccomment'>/// Apply case folding to this range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Since case folding might add characters such that the range is no</span>
+    <span class='doccomment'>/// longer contiguous, this returns multiple class ranges. They are in</span>
+    <span class='doccomment'>/// canonical order.</span>
+    <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>start</span> <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='self'>self</span>.<span class='ident'>end</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='self'>self</span>.<span class='ident'>start</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>start</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>start</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='number'>100</span>);
+        <span class='kw'>for</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='kw'>in</span> (<span class='ident'>s</span><span class='op'>+</span><span class='number'>1</span>..<span class='ident'>e</span>).<span class='ident'>filter_map</span>(<span class='ident'>char</span>::<span class='ident'>from_u32</span>) {
+            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='ident'>next_case_fold</span> {
+                <span class='ident'>c</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>) {
+                    <span class='prelude-val'>Ok</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>,
+                    <span class='prelude-val'>Err</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> {
+                        <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&lt;</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>len</span>() {
+                            <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>0</span>;
+                        } <span class='kw'>else</span> {
+                            <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='string'>&#39;\u{10FFFF}&#39;</span>
+                        }
+                        <span class='ident'>c</span>
+                    }
+                };
+            }
+            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='ident'>inc_char</span>(<span class='ident'>end</span>) {
+                <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+                <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>c</span>;
+            }
+            <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>c</span>;
+        }
+        <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+        <span class='ident'>ranges</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='self'>self</span>.<span class='ident'>start</span> <span class='op'>&lt;=</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&amp;&amp;</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&lt;=</span> <span class='self'>self</span>.<span class='ident'>end</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>other</span>.<span class='ident'>eq</span>(<span class='self'>self</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='prelude-val'>Some</span>(<span class='kw'>if</span> <span class='self'>self</span> <span class='op'>==</span> <span class='ident'>other</span> {
+            <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
+        } <span class='kw'>else</span> <span class='kw'>if</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&gt;</span> <span class='self'>self</span>.<span class='ident'>end</span> {
+            <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
+        } <span class='kw'>else</span> {
+            <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
+        })
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='ident'>other</span>.<span class='ident'>partial_cmp</span>(<span class='self'>self</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>o</span><span class='op'>|</span> <span class='ident'>o</span>.<span class='ident'>reverse</span>())
+    }
+}
+
+<span class='doccomment'>/// This implementation of `Display` will write a regular expression from the</span>
+<span class='doccomment'>/// syntax tree. It does not write the original string parsed.</span>
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Expr</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>Empty</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;&quot;</span>),
+            <span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, <span class='ident'>casei</span> } <span class='op'>=&gt;</span> {
+                <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?i:&quot;</span>)); }
+                <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>chars</span> {
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>quote_char</span>(<span class='ident'>c</span>)));
+                }
+                <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;)&quot;</span>)); }
+                <span class='prelude-val'>Ok</span>(())
+            }
+            <span class='ident'>AnyChar</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?s:.)&quot;</span>),
+            <span class='ident'>AnyCharNoNL</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;.&quot;</span>),
+            <span class='ident'>Class</span>(<span class='kw-2'>ref</span> <span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>cls</span>),
+            <span class='ident'>StartLine</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?m:^)&quot;</span>),
+            <span class='ident'>EndLine</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?m:$)&quot;</span>),
+            <span class='ident'>StartText</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;^&quot;</span>),
+            <span class='ident'>EndText</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;$&quot;</span>),
+            <span class='ident'>WordBoundary</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;\b&quot;</span>),
+            <span class='ident'>NotWordBoundary</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;\B&quot;</span>),
+            <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>i</span>: <span class='prelude-val'>None</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span> } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?:{})&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span>, .. } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;({})&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>), .. } <span class='op'>=&gt;</span> {
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?P&lt;{}&gt;{})&quot;</span>, <span class='ident'>n</span>, <span class='ident'>e</span>)
+            }
+            <span class='ident'>Repeat</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=&gt;</span> {
+                <span class='kw'>match</span> <span class='kw-2'>&amp;</span><span class='op'>*</span><span class='op'>*</span><span class='ident'>e</span> {
+                    <span class='kw-2'>&amp;</span><span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, .. } <span class='kw'>if</span> <span class='ident'>chars</span>.<span class='ident'>len</span>() <span class='op'>&gt;</span> <span class='number'>1</span> <span class='op'>=&gt;</span> {
+                        <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?:{}){}&quot;</span>, <span class='ident'>e</span>, <span class='ident'>r</span>))
+                    }
+                    _ <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}{}&quot;</span>, <span class='ident'>e</span>, <span class='ident'>r</span>)),
+                }
+                <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>greedy</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;?&quot;</span>)); }
+                <span class='prelude-val'>Ok</span>(())
+            }
+            <span class='ident'>Concat</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+                <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> {
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>e</span>));
+                }
+                <span class='prelude-val'>Ok</span>(())
+            }
+            <span class='ident'>Alternate</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+                <span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>e</span>) <span class='kw'>in</span> <span class='ident'>es</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
+                    <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&gt;</span> <span class='number'>0</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;|&quot;</span>)); }
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>e</span>));
+                }
+                <span class='prelude-val'>Ok</span>(())
+            }
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Repeater</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>ZeroOrOne</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;?&quot;</span>),
+            <span class='ident'>ZeroOrMore</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;*&quot;</span>),
+            <span class='ident'>OneOrMore</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;+&quot;</span>),
+            <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{},}}&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='kw'>if</span> <span class='ident'>s</span> <span class='op'>==</span> <span class='ident'>e</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{}}}&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{}, {}}}&quot;</span>, <span class='ident'>s</span>, <span class='ident'>e</span>),
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> {
+            <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?i:&quot;</span>));
+        }
+        <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;[&quot;</span>));
+        <span class='kw'>for</span> <span class='ident'>range</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>iter</span>() {
+            <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>range</span>));
+        }
+        <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;]&quot;</span>));
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> {
+            <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;)&quot;</span>));
+        }
+        <span class='prelude-val'>Ok</span>(())
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}-{}&quot;</span>, <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>start</span>), <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>end</span>))
+    }
+}
+
+<span class='doccomment'>/// An alias for computations that can return a `Error`.</span>
+<span class='kw'>pub</span> <span class='kw'>type</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='op'>=</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>Error</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// A parse error.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This includes details about the specific type of error and a rough</span>
+<span class='doccomment'>/// approximation of where it occurred.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Error</span> {
+    <span class='ident'>pos</span>: <span class='ident'>usize</span>,
+    <span class='ident'>surround</span>: <span class='ident'>String</span>,
+    <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>,
+}
+
+<span class='doccomment'>/// The specific type of parse error that can occur.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>ErrorKind</span> {
+    <span class='doccomment'>/// A negation symbol is used twice in flag settings.</span>
+    <span class='doccomment'>/// e.g., `(?-i-s)`.</span>
+    <span class='ident'>DoubleFlagNegation</span>,
+    <span class='doccomment'>/// The same capture name was used more than once.</span>
+    <span class='doccomment'>/// e.g., `(?P&lt;a&gt;.)(?P&lt;a&gt;.)`.</span>
+    <span class='ident'>DuplicateCaptureName</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An alternate is empty. e.g., `(|a)`.</span>
+    <span class='ident'>EmptyAlternate</span>,
+    <span class='doccomment'>/// A capture group name is empty. e.g., `(?P&lt;&gt;a)`.</span>
+    <span class='ident'>EmptyCaptureName</span>,
+    <span class='doccomment'>/// A negation symbol was not proceded by any flags. e.g., `(?i-)`.</span>
+    <span class='ident'>EmptyFlagNegation</span>,
+    <span class='doccomment'>/// A group is empty. e.g., `()`.</span>
+    <span class='ident'>EmptyGroup</span>,
+    <span class='doccomment'>/// An invalid number was used in a counted repetition. e.g., `a{b}`.</span>
+    <span class='ident'>InvalidBase10</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An invalid hexadecimal number was used in an escape sequence.</span>
+    <span class='doccomment'>/// e.g., `\xAG`.</span>
+    <span class='ident'>InvalidBase16</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An invalid capture name was used. e.g., `(?P&lt;0a&gt;b)`.</span>
+    <span class='ident'>InvalidCaptureName</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An invalid class range was givien. Specifically, when the start of the</span>
+    <span class='doccomment'>/// range is greater than the end. e.g., `[z-a]`.</span>
+    <span class='ident'>InvalidClassRange</span> {
+        <span class='doccomment'>/// The first character specified in the range.</span>
+        <span class='ident'>start</span>: <span class='ident'>char</span>,
+        <span class='doccomment'>/// The second character specified in the range.</span>
+        <span class='ident'>end</span>: <span class='ident'>char</span>,
+    },
+    <span class='doccomment'>/// An escape sequence was used in a character class where it is not</span>
+    <span class='doccomment'>/// allowed. e.g., `[a-\pN]` or `[\A]`.</span>
+    <span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>),
+    <span class='doccomment'>/// An invalid counted repetition min/max was given. e.g., `a{2,1}`.</span>
+    <span class='ident'>InvalidRepeatRange</span> {
+        <span class='doccomment'>/// The first number specified in the repetition.</span>
+        <span class='ident'>min</span>: <span class='ident'>u32</span>,
+        <span class='doccomment'>/// The second number specified in the repetition.</span>
+        <span class='ident'>max</span>: <span class='ident'>u32</span>,
+    },
+    <span class='doccomment'>/// An invalid Unicode scalar value was used in a long hexadecimal</span>
+    <span class='doccomment'>/// sequence. e.g., `\x{D800}`.</span>
+    <span class='ident'>InvalidScalarValue</span>(<span class='ident'>u32</span>),
+    <span class='doccomment'>/// An empty counted repetition operator. e.g., `a{}`.</span>
+    <span class='ident'>MissingBase10</span>,
+    <span class='doccomment'>/// A repetition operator was not applied to an expression. e.g., `*`.</span>
+    <span class='ident'>RepeaterExpectsExpr</span>,
+    <span class='doccomment'>/// A repetition operator was applied to an expression that cannot be</span>
+    <span class='doccomment'>/// repeated. e.g., `a+*` or `a|*`.</span>
+    <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>),
+    <span class='doccomment'>/// A capture group name that is never closed. e.g., `(?P&lt;a`.</span>
+    <span class='ident'>UnclosedCaptureName</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An unclosed hexadecimal literal. e.g., `\x{a`.</span>
+    <span class='ident'>UnclosedHex</span>,
+    <span class='doccomment'>/// An unclosed parenthesis. e.g., `(a`.</span>
+    <span class='ident'>UnclosedParen</span>,
+    <span class='doccomment'>/// An unclosed counted repetition operator. e.g., `a{2`.</span>
+    <span class='ident'>UnclosedRepeat</span>,
+    <span class='doccomment'>/// An unclosed named Unicode class. e.g., `\p{Yi`.</span>
+    <span class='ident'>UnclosedUnicodeName</span>,
+    <span class='doccomment'>/// Saw end of regex before class was closed. e.g., `[a`.</span>
+    <span class='ident'>UnexpectedClassEof</span>,
+    <span class='doccomment'>/// Saw end of regex before escape sequence was closed. e.g., `\`.</span>
+    <span class='ident'>UnexpectedEscapeEof</span>,
+    <span class='doccomment'>/// Saw end of regex before flags were closed. e.g., `(?i`.</span>
+    <span class='ident'>UnexpectedFlagEof</span>,
+    <span class='doccomment'>/// Saw end of regex before two hexadecimal digits were seen. e.g., `\xA`.</span>
+    <span class='ident'>UnexpectedTwoDigitHexEof</span>,
+    <span class='doccomment'>/// Unopened parenthesis. e.g., `)`.</span>
+    <span class='ident'>UnopenedParen</span>,
+    <span class='doccomment'>/// Unrecognized escape sequence. e.g., `\q`.</span>
+    <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>char</span>),
+    <span class='doccomment'>/// Unrecognized flag. e.g., `(?a)`.</span>
+    <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>char</span>),
+    <span class='doccomment'>/// Unrecognized named Unicode class. e.g., `\p{Foo}`.</span>
+    <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// Hints that destructuring should not be exhaustive.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This enum may grow additional variants, so this makes sure clients</span>
+    <span class='doccomment'>/// don&#39;t count on exhaustive matching. (Otherwise, adding a new variant</span>
+    <span class='doccomment'>/// could break existing code.)</span>
+    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+    <span class='ident'>__Nonexhaustive</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Error</span> {
+    <span class='doccomment'>/// Returns an approximate *character* offset at which the error occurred.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The character offset may be equal to the number of characters in the</span>
+    <span class='doccomment'>/// string, in which case it should be interpreted as pointing to the end</span>
+    <span class='doccomment'>/// of the regex.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>position</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='self'>self</span>.<span class='ident'>pos</span>
+    }
+
+    <span class='doccomment'>/// Returns the type of the regex parse error.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>kind</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>ErrorKind</span> {
+        <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>kind</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>ErrorKind</span> {
+    <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
+        <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>;
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>DoubleFlagNegation</span> <span class='op'>=&gt;</span> <span class='string'>&quot;double flag negation&quot;</span>,
+            <span class='ident'>DuplicateCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;duplicate capture name&quot;</span>,
+            <span class='ident'>EmptyAlternate</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty alternate&quot;</span>,
+            <span class='ident'>EmptyCaptureName</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty capture name&quot;</span>,
+            <span class='ident'>EmptyFlagNegation</span> <span class='op'>=&gt;</span> <span class='string'>&quot;flag negation without any flags&quot;</span>,
+            <span class='ident'>EmptyGroup</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty group (e.g., &#39;()&#39;)&quot;</span>,
+            <span class='ident'>InvalidBase10</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid base 10 number&quot;</span>,
+            <span class='ident'>InvalidBase16</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid base 16 number&quot;</span>,
+            <span class='ident'>InvalidCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid capture name&quot;</span>,
+            <span class='ident'>InvalidClassRange</span>{..} <span class='op'>=&gt;</span> <span class='string'>&quot;invalid character class range&quot;</span>,
+            <span class='ident'>InvalidClassEscape</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid escape sequence in class&quot;</span>,
+            <span class='ident'>InvalidRepeatRange</span>{..} <span class='op'>=&gt;</span> <span class='string'>&quot;invalid counted repetition range&quot;</span>,
+            <span class='ident'>InvalidScalarValue</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid Unicode scalar value&quot;</span>,
+            <span class='ident'>MissingBase10</span> <span class='op'>=&gt;</span> <span class='string'>&quot;missing count in repetition operator&quot;</span>,
+            <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=&gt;</span> <span class='string'>&quot;repetition operator missing expression&quot;</span>,
+            <span class='ident'>RepeaterUnexpectedExpr</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;expression cannot be repeated&quot;</span>,
+            <span class='ident'>UnclosedCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed capture group name&quot;</span>,
+            <span class='ident'>UnclosedHex</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed hexadecimal literal&quot;</span>,
+            <span class='ident'>UnclosedParen</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed parenthesis&quot;</span>,
+            <span class='ident'>UnclosedRepeat</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed counted repetition operator&quot;</span>,
+            <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed Unicode class literal&quot;</span>,
+            <span class='ident'>UnexpectedClassEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in character class&quot;</span>,
+            <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in escape sequence&quot;</span>,
+            <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in flags&quot;</span>,
+            <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in hex literal&quot;</span>,
+            <span class='ident'>UnopenedParen</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unopened parenthesis&quot;</span>,
+            <span class='ident'>UnrecognizedEscape</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized escape sequence&quot;</span>,
+            <span class='ident'>UnrecognizedFlag</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized flag&quot;</span>,
+            <span class='ident'>UnrecognizedUnicodeClass</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized Unicode class name&quot;</span>,
+            <span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+        }
+    }
+}
+
+<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
+    <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
+        <span class='self'>self</span>.<span class='ident'>kind</span>.<span class='ident'>description</span>()
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Error parsing regex near &#39;{}&#39; at character offset {}: {}&quot;</span>,
+               <span class='self'>self</span>.<span class='ident'>surround</span>, <span class='self'>self</span>.<span class='ident'>pos</span>, <span class='self'>self</span>.<span class='ident'>kind</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ErrorKind</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>;
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>DoubleFlagNegation</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Only one negation symbol is allowed in flags.&quot;</span>),
+            <span class='ident'>DuplicateCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture name &#39;{}&#39; is used more than once.&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>EmptyAlternate</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Alternations cannot be empty.&quot;</span>),
+            <span class='ident'>EmptyCaptureName</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture names cannot be empty.&quot;</span>),
+            <span class='ident'>EmptyFlagNegation</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Flag negation requires setting at least one flag.&quot;</span>),
+            <span class='ident'>EmptyGroup</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Empty regex groups (e.g., &#39;()&#39;) are not allowed.&quot;</span>),
+            <span class='ident'>InvalidBase10</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Not a valid base 10 number: &#39;{}&#39;&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>InvalidBase16</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Not a valid base 16 number: &#39;{}&#39;&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>InvalidCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid capture name: &#39;{}&#39;. Capture names must \
+                           consist of [_a-zA-Z0-9] and are not allowed to \
+                           start with with a number.&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>InvalidClassRange</span> { <span class='ident'>start</span>, <span class='ident'>end</span> } <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid character class range &#39;{}-{}&#39;. \
+                           Character class ranges must start with the smaller \
+                           character, but {} &gt; {}&quot;</span>, <span class='ident'>start</span>, <span class='ident'>end</span>, <span class='ident'>start</span>, <span class='ident'>end</span>),
+            <span class='ident'>InvalidClassEscape</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid escape sequence in character \
+                           class: &#39;{}&#39;.&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>InvalidRepeatRange</span> { <span class='ident'>min</span>, <span class='ident'>max</span> } <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid counted repetition range: {{{}, {}}}. \
+                           Counted repetition ranges must start with the \
+                           minimum, but {} &gt; {}&quot;</span>, <span class='ident'>min</span>, <span class='ident'>max</span>, <span class='ident'>min</span>, <span class='ident'>max</span>),
+            <span class='ident'>InvalidScalarValue</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Number does not correspond to a Unicode scalar \
+                           value: &#39;{}&#39;.&quot;</span>, <span class='ident'>c</span>),
+            <span class='ident'>MissingBase10</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Missing maximum in counted reptition operator.&quot;</span>),
+            <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Missing expression for reptition operator.&quot;</span>),
+            <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid application of reptition operator to: \
+                          &#39;{}&#39;.&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>UnclosedCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture name group for &#39;{}&#39; is not closed. \
+                           (Missing a &#39;&gt;&#39;.)&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>UnclosedHex</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed hexadecimal literal (missing a &#39;}}&#39;).&quot;</span>),
+            <span class='ident'>UnclosedParen</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed parenthesis.&quot;</span>),
+            <span class='ident'>UnclosedRepeat</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed counted repetition (missing a &#39;}}&#39;).&quot;</span>),
+            <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed Unicode literal (missing a &#39;}}&#39;).&quot;</span>),
+            <span class='ident'>UnexpectedClassEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Character class was not closed before the end of \
+                           the regex (missing a &#39;]&#39;).&quot;</span>),
+            <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Started an escape sequence that didn&#39;t finish \
+                           before the end of the regex.&quot;</span>),
+            <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Inline flag settings was not closed before the end \
+                           of the regex (missing a &#39;)&#39; or &#39;:&#39;).&quot;</span>),
+            <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unexpected end of two digit hexadecimal literal.&quot;</span>),
+            <span class='ident'>UnopenedParen</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unopened parenthesis.&quot;</span>),
+            <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized escape sequence: &#39;\\{}&#39;.&quot;</span>, <span class='ident'>c</span>),
+            <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized flag: &#39;{}&#39;. \
+                           (Allowed flags: i, s, m, U, x.)&quot;</span>, <span class='ident'>c</span>),
+            <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized Unicode class name: &#39;{}&#39;.&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+        }
+    }
+}
+
+<span class='doccomment'>/// Returns the Unicode *simple* case folding of `c`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// N.B. This is hidden because it really isn&#39;t the responsibility of this</span>
+<span class='doccomment'>/// crate to do simple case folding. One hopes that either another crate or</span>
+<span class='doccomment'>/// the standard library will be able to do this for us. In any case, we still</span>
+<span class='doccomment'>/// expose it because it is used inside the various Regex engines.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+    <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>)
+        .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+        .<span class='ident'>unwrap_or</span>(<span class='ident'>c</span>)
+}
+
+<span class='doccomment'>/// The result of binary search on the simple case folding table.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This level of detail is exposed so that we can do case folding on a</span>
+<span class='doccomment'>/// range of characters efficiently.</span>
+<span class='kw'>fn</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span>, <span class='ident'>usize</span><span class='op'>&gt;</span> {
+    <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>x</span>, _)<span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>))
+}
+
+<span class='doccomment'>/// Escapes all regular expression meta characters in `text`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The string returned may be safely used as a literal in a regular</span>
+<span class='doccomment'>/// expression.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>quote</span>(<span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>quoted</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>text</span>.<span class='ident'>len</span>());
+    <span class='kw'>for</span> <span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>text</span>.<span class='ident'>chars</span>() {
+        <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+            <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>);
+        }
+        <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
+    }
+    <span class='ident'>quoted</span>
+}
+
+<span class='kw'>fn</span> <span class='ident'>quote_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>new</span>();
+    <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+        <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>);
+    }
+    <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
+    <span class='ident'>s</span>
+}
+
+<span class='kw'>fn</span> <span class='ident'>inc_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='ident'>char</span>::<span class='ident'>MAX</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>MAX</span>,
+        <span class='string'>&#39;\u{D7FF}&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\u{E000}&#39;</span>,
+        <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(),
+    }
+}
+
+<span class='kw'>fn</span> <span class='ident'>dec_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='string'>&#39;\x00&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\x00&#39;</span>,
+        <span class='string'>&#39;\u{E000}&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\u{D7FF}&#39;</span>,
+        <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>-</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(),
+    }
+}
+
+<span class='doccomment'>/// Returns true if and only if `c` is a word character.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_word_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='string'>&#39;_&#39;</span> <span class='op'>|</span> <span class='string'>&#39;0&#39;</span> ... <span class='string'>&#39;9&#39;</span> <span class='op'>|</span> <span class='string'>&#39;a&#39;</span> ... <span class='string'>&#39;z&#39;</span> <span class='op'>|</span> <span class='string'>&#39;A&#39;</span> ... <span class='string'>&#39;Z&#39;</span>  <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+        _ <span class='op'>=&gt;</span> ::<span class='ident'>unicode</span>::<span class='ident'>regex</span>::<span class='ident'>PERLW</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>start</span>, <span class='ident'>end</span>)<span class='op'>|</span> {
+            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='ident'>start</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='ident'>end</span> {
+                <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
+            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>&gt;</span> <span class='ident'>c</span> {
+                <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
+            } <span class='kw'>else</span> {
+                <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
+            }
+        }).<span class='ident'>is_ok</span>(),
+    }
+}
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>properties</span>;
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>tests</span> {
+    <span class='kw'>use</span> {<span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>};
+
+    <span class='kw'>fn</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>ranges</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>()
+                           .<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)).<span class='ident'>collect</span>();
+        <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>ranges</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>classi</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>);
+        <span class='ident'>cls</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+        <span class='ident'>cls</span>
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_no_change</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>cls</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_unordered</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;w&#39;</span>, <span class='string'>&#39;y&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;w&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;c&#39;</span>, <span class='string'>&#39;f&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;g&#39;</span>), (<span class='string'>&#39;d&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>),
+            (<span class='string'>&#39;m&#39;</span>, <span class='string'>&#39;p&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+        ]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many_case_fold</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;C&#39;</span>, <span class='string'>&#39;F&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;G&#39;</span>), (<span class='string'>&#39;D&#39;</span>, <span class='string'>&#39;J&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;C&#39;</span>),
+            (<span class='string'>&#39;M&#39;</span>, <span class='string'>&#39;P&#39;</span>), (<span class='string'>&#39;L&#39;</span>, <span class='string'>&#39;S&#39;</span>), (<span class='string'>&#39;c&#39;</span>, <span class='string'>&#39;f&#39;</span>),
+        ]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_boundary</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;u&#39;</span>, <span class='string'>&#39;w&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;u&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_extreme_edge_case</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>), (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_singles</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>), (<span class='string'>&#39;b&#39;</span>, <span class='string'>&#39;b&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;b&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_single</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_singles</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>), (<span class='string'>&#39;b&#39;</span>, <span class='string'>&#39;b&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x63&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_multiples</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x64&#39;</span>, <span class='string'>&#39;\x77&#39;</span>), (<span class='string'>&#39;\x7b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_min_scalar</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;a&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_max_scalar</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_everything</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_everything_sans_one</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFD}&#39;</span>), (<span class='string'>&#39;\u{10FFFF}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)
+        ]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{10FFFE}&#39;</span>, <span class='string'>&#39;\u{10FFFE}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{E000}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min_edge</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FE}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{D7FF}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\u{E000}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max_edge</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\u{E001}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{E000}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_retain_only_needed</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_az</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_a_underscore</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>),
+        ]));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_a_equals</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>),
+        ]));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_no_folding_needed</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x10&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x10&#39;</span>),
+        ]));
+    }
+}
+</pre>
+</section>
+    <section id='search' class="content hidden"></section>
+
+    <section class="footer"></section>
+
+    <div id="help" class="hidden">
+        <div class="shortcuts">
+            <h1>Keyboard shortcuts</h1>
+            <dl>
+                <dt>?</dt>
+                <dd>Show this help dialog</dd>
+                <dt>S</dt>
+                <dd>Focus the search field</dd>
+                <dt>&larrb;</dt>
+                <dd>Move up in search results</dd>
+                <dt>&rarrb;</dt>
+                <dd>Move down in search results</dd>
+                <dt>&#9166;</dt>
+                <dd>Go to active search result</dd>
+            </dl>
+        </div>
+        <div class="infos">
+            <h1>Search tricks</h1>
+            <p>
+                Prefix searches with a type followed by a colon (e.g.
+                <code>fn:</code>) to restrict the search to a given type.
+            </p>
+            <p>
+                Accepted types are: <code>fn</code>, <code>mod</code>,
+                <code>struct</code>, <code>enum</code>,
+                <code>trait</code>, <code>typedef</code> (or
+                <code>tdef</code>).
+            </p>
+            <p>
+                Search functions by type signature (e.g.
+                <code>vec -> usize</code>)
+            </p>
+        </div>
+    </div>
+
+    
+
+    <script>
+        window.rootPath = "../../";
+        window.currentCrate = "regex_syntax";
+        window.playgroundUrl = "";
+    </script>
+    <script src="../../jquery.js"></script>
+    <script src="../../main.js"></script>
+    
+    <script async src="../../search-index.js"></script>
+</body>
+</html>
+\ No newline at end of file
diff --git a/src/regex_syntax/parser.rs.html b/src/regex_syntax/parser.rs.html
new file mode 100644
index 0000000..3f94959
--- /dev/null
+++ b/src/regex_syntax/parser.rs.html
@@ -0,0 +1,4751 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="generator" content="rustdoc">
+    <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/regex-syntax-0.1.2/src/parser.rs`.">
+    <meta name="keywords" content="rust, rustlang, rust-lang">
+
+    <title>parser.rs.html -- source</title>
+
+    <link rel="stylesheet" type="text/css" href="../../main.css">
+
+    
+    
+</head>
+<body class="rustdoc">
+    <!--[if lte IE 8]>
+    <div class="warning">
+        This old browser is unsupported and will most likely display funky
+        things.
+    </div>
+    <![endif]-->
+
+    
+
+    <section class="sidebar">
+        
+        
+    </section>
+
+    <nav class="sub">
+        <form class="search-form js-only">
+            <div class="search-container">
+                <input class="search-input" name="search"
+                       autocomplete="off"
+                       placeholder="Click or press 'S' to search, '?' for more options..."
+                       type="search">
+            </div>
+        </form>
+    </nav>
+
+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">   1</span>
+<span id="2">   2</span>
+<span id="3">   3</span>
+<span id="4">   4</span>
+<span id="5">   5</span>
+<span id="6">   6</span>
+<span id="7">   7</span>
+<span id="8">   8</span>
+<span id="9">   9</span>
+<span id="10">  10</span>
+<span id="11">  11</span>
+<span id="12">  12</span>
+<span id="13">  13</span>
+<span id="14">  14</span>
+<span id="15">  15</span>
+<span id="16">  16</span>
+<span id="17">  17</span>
+<span id="18">  18</span>
+<span id="19">  19</span>
+<span id="20">  20</span>
+<span id="21">  21</span>
+<span id="22">  22</span>
+<span id="23">  23</span>
+<span id="24">  24</span>
+<span id="25">  25</span>
+<span id="26">  26</span>
+<span id="27">  27</span>
+<span id="28">  28</span>
+<span id="29">  29</span>
+<span id="30">  30</span>
+<span id="31">  31</span>
+<span id="32">  32</span>
+<span id="33">  33</span>
+<span id="34">  34</span>
+<span id="35">  35</span>
+<span id="36">  36</span>
+<span id="37">  37</span>
+<span id="38">  38</span>
+<span id="39">  39</span>
+<span id="40">  40</span>
+<span id="41">  41</span>
+<span id="42">  42</span>
+<span id="43">  43</span>
+<span id="44">  44</span>
+<span id="45">  45</span>
+<span id="46">  46</span>
+<span id="47">  47</span>
+<span id="48">  48</span>
+<span id="49">  49</span>
+<span id="50">  50</span>
+<span id="51">  51</span>
+<span id="52">  52</span>
+<span id="53">  53</span>
+<span id="54">  54</span>
+<span id="55">  55</span>
+<span id="56">  56</span>
+<span id="57">  57</span>
+<span id="58">  58</span>
+<span id="59">  59</span>
+<span id="60">  60</span>
+<span id="61">  61</span>
+<span id="62">  62</span>
+<span id="63">  63</span>
+<span id="64">  64</span>
+<span id="65">  65</span>
+<span id="66">  66</span>
+<span id="67">  67</span>
+<span id="68">  68</span>
+<span id="69">  69</span>
+<span id="70">  70</span>
+<span id="71">  71</span>
+<span id="72">  72</span>
+<span id="73">  73</span>
+<span id="74">  74</span>
+<span id="75">  75</span>
+<span id="76">  76</span>
+<span id="77">  77</span>
+<span id="78">  78</span>
+<span id="79">  79</span>
+<span id="80">  80</span>
+<span id="81">  81</span>
+<span id="82">  82</span>
+<span id="83">  83</span>
+<span id="84">  84</span>
+<span id="85">  85</span>
+<span id="86">  86</span>
+<span id="87">  87</span>
+<span id="88">  88</span>
+<span id="89">  89</span>
+<span id="90">  90</span>
+<span id="91">  91</span>
+<span id="92">  92</span>
+<span id="93">  93</span>
+<span id="94">  94</span>
+<span id="95">  95</span>
+<span id="96">  96</span>
+<span id="97">  97</span>
+<span id="98">  98</span>
+<span id="99">  99</span>
+<span id="100"> 100</span>
+<span id="101"> 101</span>
+<span id="102"> 102</span>
+<span id="103"> 103</span>
+<span id="104"> 104</span>
+<span id="105"> 105</span>
+<span id="106"> 106</span>
+<span id="107"> 107</span>
+<span id="108"> 108</span>
+<span id="109"> 109</span>
+<span id="110"> 110</span>
+<span id="111"> 111</span>
+<span id="112"> 112</span>
+<span id="113"> 113</span>
+<span id="114"> 114</span>
+<span id="115"> 115</span>
+<span id="116"> 116</span>
+<span id="117"> 117</span>
+<span id="118"> 118</span>
+<span id="119"> 119</span>
+<span id="120"> 120</span>
+<span id="121"> 121</span>
+<span id="122"> 122</span>
+<span id="123"> 123</span>
+<span id="124"> 124</span>
+<span id="125"> 125</span>
+<span id="126"> 126</span>
+<span id="127"> 127</span>
+<span id="128"> 128</span>
+<span id="129"> 129</span>
+<span id="130"> 130</span>
+<span id="131"> 131</span>
+<span id="132"> 132</span>
+<span id="133"> 133</span>
+<span id="134"> 134</span>
+<span id="135"> 135</span>
+<span id="136"> 136</span>
+<span id="137"> 137</span>
+<span id="138"> 138</span>
+<span id="139"> 139</span>
+<span id="140"> 140</span>
+<span id="141"> 141</span>
+<span id="142"> 142</span>
+<span id="143"> 143</span>
+<span id="144"> 144</span>
+<span id="145"> 145</span>
+<span id="146"> 146</span>
+<span id="147"> 147</span>
+<span id="148"> 148</span>
+<span id="149"> 149</span>
+<span id="150"> 150</span>
+<span id="151"> 151</span>
+<span id="152"> 152</span>
+<span id="153"> 153</span>
+<span id="154"> 154</span>
+<span id="155"> 155</span>
+<span id="156"> 156</span>
+<span id="157"> 157</span>
+<span id="158"> 158</span>
+<span id="159"> 159</span>
+<span id="160"> 160</span>
+<span id="161"> 161</span>
+<span id="162"> 162</span>
+<span id="163"> 163</span>
+<span id="164"> 164</span>
+<span id="165"> 165</span>
+<span id="166"> 166</span>
+<span id="167"> 167</span>
+<span id="168"> 168</span>
+<span id="169"> 169</span>
+<span id="170"> 170</span>
+<span id="171"> 171</span>
+<span id="172"> 172</span>
+<span id="173"> 173</span>
+<span id="174"> 174</span>
+<span id="175"> 175</span>
+<span id="176"> 176</span>
+<span id="177"> 177</span>
+<span id="178"> 178</span>
+<span id="179"> 179</span>
+<span id="180"> 180</span>
+<span id="181"> 181</span>
+<span id="182"> 182</span>
+<span id="183"> 183</span>
+<span id="184"> 184</span>
+<span id="185"> 185</span>
+<span id="186"> 186</span>
+<span id="187"> 187</span>
+<span id="188"> 188</span>
+<span id="189"> 189</span>
+<span id="190"> 190</span>
+<span id="191"> 191</span>
+<span id="192"> 192</span>
+<span id="193"> 193</span>
+<span id="194"> 194</span>
+<span id="195"> 195</span>
+<span id="196"> 196</span>
+<span id="197"> 197</span>
+<span id="198"> 198</span>
+<span id="199"> 199</span>
+<span id="200"> 200</span>
+<span id="201"> 201</span>
+<span id="202"> 202</span>
+<span id="203"> 203</span>
+<span id="204"> 204</span>
+<span id="205"> 205</span>
+<span id="206"> 206</span>
+<span id="207"> 207</span>
+<span id="208"> 208</span>
+<span id="209"> 209</span>
+<span id="210"> 210</span>
+<span id="211"> 211</span>
+<span id="212"> 212</span>
+<span id="213"> 213</span>
+<span id="214"> 214</span>
+<span id="215"> 215</span>
+<span id="216"> 216</span>
+<span id="217"> 217</span>
+<span id="218"> 218</span>
+<span id="219"> 219</span>
+<span id="220"> 220</span>
+<span id="221"> 221</span>
+<span id="222"> 222</span>
+<span id="223"> 223</span>
+<span id="224"> 224</span>
+<span id="225"> 225</span>
+<span id="226"> 226</span>
+<span id="227"> 227</span>
+<span id="228"> 228</span>
+<span id="229"> 229</span>
+<span id="230"> 230</span>
+<span id="231"> 231</span>
+<span id="232"> 232</span>
+<span id="233"> 233</span>
+<span id="234"> 234</span>
+<span id="235"> 235</span>
+<span id="236"> 236</span>
+<span id="237"> 237</span>
+<span id="238"> 238</span>
+<span id="239"> 239</span>
+<span id="240"> 240</span>
+<span id="241"> 241</span>
+<span id="242"> 242</span>
+<span id="243"> 243</span>
+<span id="244"> 244</span>
+<span id="245"> 245</span>
+<span id="246"> 246</span>
+<span id="247"> 247</span>
+<span id="248"> 248</span>
+<span id="249"> 249</span>
+<span id="250"> 250</span>
+<span id="251"> 251</span>
+<span id="252"> 252</span>
+<span id="253"> 253</span>
+<span id="254"> 254</span>
+<span id="255"> 255</span>
+<span id="256"> 256</span>
+<span id="257"> 257</span>
+<span id="258"> 258</span>
+<span id="259"> 259</span>
+<span id="260"> 260</span>
+<span id="261"> 261</span>
+<span id="262"> 262</span>
+<span id="263"> 263</span>
+<span id="264"> 264</span>
+<span id="265"> 265</span>
+<span id="266"> 266</span>
+<span id="267"> 267</span>
+<span id="268"> 268</span>
+<span id="269"> 269</span>
+<span id="270"> 270</span>
+<span id="271"> 271</span>
+<span id="272"> 272</span>
+<span id="273"> 273</span>
+<span id="274"> 274</span>
+<span id="275"> 275</span>
+<span id="276"> 276</span>
+<span id="277"> 277</span>
+<span id="278"> 278</span>
+<span id="279"> 279</span>
+<span id="280"> 280</span>
+<span id="281"> 281</span>
+<span id="282"> 282</span>
+<span id="283"> 283</span>
+<span id="284"> 284</span>
+<span id="285"> 285</span>
+<span id="286"> 286</span>
+<span id="287"> 287</span>
+<span id="288"> 288</span>
+<span id="289"> 289</span>
+<span id="290"> 290</span>
+<span id="291"> 291</span>
+<span id="292"> 292</span>
+<span id="293"> 293</span>
+<span id="294"> 294</span>
+<span id="295"> 295</span>
+<span id="296"> 296</span>
+<span id="297"> 297</span>
+<span id="298"> 298</span>
+<span id="299"> 299</span>
+<span id="300"> 300</span>
+<span id="301"> 301</span>
+<span id="302"> 302</span>
+<span id="303"> 303</span>
+<span id="304"> 304</span>
+<span id="305"> 305</span>
+<span id="306"> 306</span>
+<span id="307"> 307</span>
+<span id="308"> 308</span>
+<span id="309"> 309</span>
+<span id="310"> 310</span>
+<span id="311"> 311</span>
+<span id="312"> 312</span>
+<span id="313"> 313</span>
+<span id="314"> 314</span>
+<span id="315"> 315</span>
+<span id="316"> 316</span>
+<span id="317"> 317</span>
+<span id="318"> 318</span>
+<span id="319"> 319</span>
+<span id="320"> 320</span>
+<span id="321"> 321</span>
+<span id="322"> 322</span>
+<span id="323"> 323</span>
+<span id="324"> 324</span>
+<span id="325"> 325</span>
+<span id="326"> 326</span>
+<span id="327"> 327</span>
+<span id="328"> 328</span>
+<span id="329"> 329</span>
+<span id="330"> 330</span>
+<span id="331"> 331</span>
+<span id="332"> 332</span>
+<span id="333"> 333</span>
+<span id="334"> 334</span>
+<span id="335"> 335</span>
+<span id="336"> 336</span>
+<span id="337"> 337</span>
+<span id="338"> 338</span>
+<span id="339"> 339</span>
+<span id="340"> 340</span>
+<span id="341"> 341</span>
+<span id="342"> 342</span>
+<span id="343"> 343</span>
+<span id="344"> 344</span>
+<span id="345"> 345</span>
+<span id="346"> 346</span>
+<span id="347"> 347</span>
+<span id="348"> 348</span>
+<span id="349"> 349</span>
+<span id="350"> 350</span>
+<span id="351"> 351</span>
+<span id="352"> 352</span>
+<span id="353"> 353</span>
+<span id="354"> 354</span>
+<span id="355"> 355</span>
+<span id="356"> 356</span>
+<span id="357"> 357</span>
+<span id="358"> 358</span>
+<span id="359"> 359</span>
+<span id="360"> 360</span>
+<span id="361"> 361</span>
+<span id="362"> 362</span>
+<span id="363"> 363</span>
+<span id="364"> 364</span>
+<span id="365"> 365</span>
+<span id="366"> 366</span>
+<span id="367"> 367</span>
+<span id="368"> 368</span>
+<span id="369"> 369</span>
+<span id="370"> 370</span>
+<span id="371"> 371</span>
+<span id="372"> 372</span>
+<span id="373"> 373</span>
+<span id="374"> 374</span>
+<span id="375"> 375</span>
+<span id="376"> 376</span>
+<span id="377"> 377</span>
+<span id="378"> 378</span>
+<span id="379"> 379</span>
+<span id="380"> 380</span>
+<span id="381"> 381</span>
+<span id="382"> 382</span>
+<span id="383"> 383</span>
+<span id="384"> 384</span>
+<span id="385"> 385</span>
+<span id="386"> 386</span>
+<span id="387"> 387</span>
+<span id="388"> 388</span>
+<span id="389"> 389</span>
+<span id="390"> 390</span>
+<span id="391"> 391</span>
+<span id="392"> 392</span>
+<span id="393"> 393</span>
+<span id="394"> 394</span>
+<span id="395"> 395</span>
+<span id="396"> 396</span>
+<span id="397"> 397</span>
+<span id="398"> 398</span>
+<span id="399"> 399</span>
+<span id="400"> 400</span>
+<span id="401"> 401</span>
+<span id="402"> 402</span>
+<span id="403"> 403</span>
+<span id="404"> 404</span>
+<span id="405"> 405</span>
+<span id="406"> 406</span>
+<span id="407"> 407</span>
+<span id="408"> 408</span>
+<span id="409"> 409</span>
+<span id="410"> 410</span>
+<span id="411"> 411</span>
+<span id="412"> 412</span>
+<span id="413"> 413</span>
+<span id="414"> 414</span>
+<span id="415"> 415</span>
+<span id="416"> 416</span>
+<span id="417"> 417</span>
+<span id="418"> 418</span>
+<span id="419"> 419</span>
+<span id="420"> 420</span>
+<span id="421"> 421</span>
+<span id="422"> 422</span>
+<span id="423"> 423</span>
+<span id="424"> 424</span>
+<span id="425"> 425</span>
+<span id="426"> 426</span>
+<span id="427"> 427</span>
+<span id="428"> 428</span>
+<span id="429"> 429</span>
+<span id="430"> 430</span>
+<span id="431"> 431</span>
+<span id="432"> 432</span>
+<span id="433"> 433</span>
+<span id="434"> 434</span>
+<span id="435"> 435</span>
+<span id="436"> 436</span>
+<span id="437"> 437</span>
+<span id="438"> 438</span>
+<span id="439"> 439</span>
+<span id="440"> 440</span>
+<span id="441"> 441</span>
+<span id="442"> 442</span>
+<span id="443"> 443</span>
+<span id="444"> 444</span>
+<span id="445"> 445</span>
+<span id="446"> 446</span>
+<span id="447"> 447</span>
+<span id="448"> 448</span>
+<span id="449"> 449</span>
+<span id="450"> 450</span>
+<span id="451"> 451</span>
+<span id="452"> 452</span>
+<span id="453"> 453</span>
+<span id="454"> 454</span>
+<span id="455"> 455</span>
+<span id="456"> 456</span>
+<span id="457"> 457</span>
+<span id="458"> 458</span>
+<span id="459"> 459</span>
+<span id="460"> 460</span>
+<span id="461"> 461</span>
+<span id="462"> 462</span>
+<span id="463"> 463</span>
+<span id="464"> 464</span>
+<span id="465"> 465</span>
+<span id="466"> 466</span>
+<span id="467"> 467</span>
+<span id="468"> 468</span>
+<span id="469"> 469</span>
+<span id="470"> 470</span>
+<span id="471"> 471</span>
+<span id="472"> 472</span>
+<span id="473"> 473</span>
+<span id="474"> 474</span>
+<span id="475"> 475</span>
+<span id="476"> 476</span>
+<span id="477"> 477</span>
+<span id="478"> 478</span>
+<span id="479"> 479</span>
+<span id="480"> 480</span>
+<span id="481"> 481</span>
+<span id="482"> 482</span>
+<span id="483"> 483</span>
+<span id="484"> 484</span>
+<span id="485"> 485</span>
+<span id="486"> 486</span>
+<span id="487"> 487</span>
+<span id="488"> 488</span>
+<span id="489"> 489</span>
+<span id="490"> 490</span>
+<span id="491"> 491</span>
+<span id="492"> 492</span>
+<span id="493"> 493</span>
+<span id="494"> 494</span>
+<span id="495"> 495</span>
+<span id="496"> 496</span>
+<span id="497"> 497</span>
+<span id="498"> 498</span>
+<span id="499"> 499</span>
+<span id="500"> 500</span>
+<span id="501"> 501</span>
+<span id="502"> 502</span>
+<span id="503"> 503</span>
+<span id="504"> 504</span>
+<span id="505"> 505</span>
+<span id="506"> 506</span>
+<span id="507"> 507</span>
+<span id="508"> 508</span>
+<span id="509"> 509</span>
+<span id="510"> 510</span>
+<span id="511"> 511</span>
+<span id="512"> 512</span>
+<span id="513"> 513</span>
+<span id="514"> 514</span>
+<span id="515"> 515</span>
+<span id="516"> 516</span>
+<span id="517"> 517</span>
+<span id="518"> 518</span>
+<span id="519"> 519</span>
+<span id="520"> 520</span>
+<span id="521"> 521</span>
+<span id="522"> 522</span>
+<span id="523"> 523</span>
+<span id="524"> 524</span>
+<span id="525"> 525</span>
+<span id="526"> 526</span>
+<span id="527"> 527</span>
+<span id="528"> 528</span>
+<span id="529"> 529</span>
+<span id="530"> 530</span>
+<span id="531"> 531</span>
+<span id="532"> 532</span>
+<span id="533"> 533</span>
+<span id="534"> 534</span>
+<span id="535"> 535</span>
+<span id="536"> 536</span>
+<span id="537"> 537</span>
+<span id="538"> 538</span>
+<span id="539"> 539</span>
+<span id="540"> 540</span>
+<span id="541"> 541</span>
+<span id="542"> 542</span>
+<span id="543"> 543</span>
+<span id="544"> 544</span>
+<span id="545"> 545</span>
+<span id="546"> 546</span>
+<span id="547"> 547</span>
+<span id="548"> 548</span>
+<span id="549"> 549</span>
+<span id="550"> 550</span>
+<span id="551"> 551</span>
+<span id="552"> 552</span>
+<span id="553"> 553</span>
+<span id="554"> 554</span>
+<span id="555"> 555</span>
+<span id="556"> 556</span>
+<span id="557"> 557</span>
+<span id="558"> 558</span>
+<span id="559"> 559</span>
+<span id="560"> 560</span>
+<span id="561"> 561</span>
+<span id="562"> 562</span>
+<span id="563"> 563</span>
+<span id="564"> 564</span>
+<span id="565"> 565</span>
+<span id="566"> 566</span>
+<span id="567"> 567</span>
+<span id="568"> 568</span>
+<span id="569"> 569</span>
+<span id="570"> 570</span>
+<span id="571"> 571</span>
+<span id="572"> 572</span>
+<span id="573"> 573</span>
+<span id="574"> 574</span>
+<span id="575"> 575</span>
+<span id="576"> 576</span>
+<span id="577"> 577</span>
+<span id="578"> 578</span>
+<span id="579"> 579</span>
+<span id="580"> 580</span>
+<span id="581"> 581</span>
+<span id="582"> 582</span>
+<span id="583"> 583</span>
+<span id="584"> 584</span>
+<span id="585"> 585</span>
+<span id="586"> 586</span>
+<span id="587"> 587</span>
+<span id="588"> 588</span>
+<span id="589"> 589</span>
+<span id="590"> 590</span>
+<span id="591"> 591</span>
+<span id="592"> 592</span>
+<span id="593"> 593</span>
+<span id="594"> 594</span>
+<span id="595"> 595</span>
+<span id="596"> 596</span>
+<span id="597"> 597</span>
+<span id="598"> 598</span>
+<span id="599"> 599</span>
+<span id="600"> 600</span>
+<span id="601"> 601</span>
+<span id="602"> 602</span>
+<span id="603"> 603</span>
+<span id="604"> 604</span>
+<span id="605"> 605</span>
+<span id="606"> 606</span>
+<span id="607"> 607</span>
+<span id="608"> 608</span>
+<span id="609"> 609</span>
+<span id="610"> 610</span>
+<span id="611"> 611</span>
+<span id="612"> 612</span>
+<span id="613"> 613</span>
+<span id="614"> 614</span>
+<span id="615"> 615</span>
+<span id="616"> 616</span>
+<span id="617"> 617</span>
+<span id="618"> 618</span>
+<span id="619"> 619</span>
+<span id="620"> 620</span>
+<span id="621"> 621</span>
+<span id="622"> 622</span>
+<span id="623"> 623</span>
+<span id="624"> 624</span>
+<span id="625"> 625</span>
+<span id="626"> 626</span>
+<span id="627"> 627</span>
+<span id="628"> 628</span>
+<span id="629"> 629</span>
+<span id="630"> 630</span>
+<span id="631"> 631</span>
+<span id="632"> 632</span>
+<span id="633"> 633</span>
+<span id="634"> 634</span>
+<span id="635"> 635</span>
+<span id="636"> 636</span>
+<span id="637"> 637</span>
+<span id="638"> 638</span>
+<span id="639"> 639</span>
+<span id="640"> 640</span>
+<span id="641"> 641</span>
+<span id="642"> 642</span>
+<span id="643"> 643</span>
+<span id="644"> 644</span>
+<span id="645"> 645</span>
+<span id="646"> 646</span>
+<span id="647"> 647</span>
+<span id="648"> 648</span>
+<span id="649"> 649</span>
+<span id="650"> 650</span>
+<span id="651"> 651</span>
+<span id="652"> 652</span>
+<span id="653"> 653</span>
+<span id="654"> 654</span>
+<span id="655"> 655</span>
+<span id="656"> 656</span>
+<span id="657"> 657</span>
+<span id="658"> 658</span>
+<span id="659"> 659</span>
+<span id="660"> 660</span>
+<span id="661"> 661</span>
+<span id="662"> 662</span>
+<span id="663"> 663</span>
+<span id="664"> 664</span>
+<span id="665"> 665</span>
+<span id="666"> 666</span>
+<span id="667"> 667</span>
+<span id="668"> 668</span>
+<span id="669"> 669</span>
+<span id="670"> 670</span>
+<span id="671"> 671</span>
+<span id="672"> 672</span>
+<span id="673"> 673</span>
+<span id="674"> 674</span>
+<span id="675"> 675</span>
+<span id="676"> 676</span>
+<span id="677"> 677</span>
+<span id="678"> 678</span>
+<span id="679"> 679</span>
+<span id="680"> 680</span>
+<span id="681"> 681</span>
+<span id="682"> 682</span>
+<span id="683"> 683</span>
+<span id="684"> 684</span>
+<span id="685"> 685</span>
+<span id="686"> 686</span>
+<span id="687"> 687</span>
+<span id="688"> 688</span>
+<span id="689"> 689</span>
+<span id="690"> 690</span>
+<span id="691"> 691</span>
+<span id="692"> 692</span>
+<span id="693"> 693</span>
+<span id="694"> 694</span>
+<span id="695"> 695</span>
+<span id="696"> 696</span>
+<span id="697"> 697</span>
+<span id="698"> 698</span>
+<span id="699"> 699</span>
+<span id="700"> 700</span>
+<span id="701"> 701</span>
+<span id="702"> 702</span>
+<span id="703"> 703</span>
+<span id="704"> 704</span>
+<span id="705"> 705</span>
+<span id="706"> 706</span>
+<span id="707"> 707</span>
+<span id="708"> 708</span>
+<span id="709"> 709</span>
+<span id="710"> 710</span>
+<span id="711"> 711</span>
+<span id="712"> 712</span>
+<span id="713"> 713</span>
+<span id="714"> 714</span>
+<span id="715"> 715</span>
+<span id="716"> 716</span>
+<span id="717"> 717</span>
+<span id="718"> 718</span>
+<span id="719"> 719</span>
+<span id="720"> 720</span>
+<span id="721"> 721</span>
+<span id="722"> 722</span>
+<span id="723"> 723</span>
+<span id="724"> 724</span>
+<span id="725"> 725</span>
+<span id="726"> 726</span>
+<span id="727"> 727</span>
+<span id="728"> 728</span>
+<span id="729"> 729</span>
+<span id="730"> 730</span>
+<span id="731"> 731</span>
+<span id="732"> 732</span>
+<span id="733"> 733</span>
+<span id="734"> 734</span>
+<span id="735"> 735</span>
+<span id="736"> 736</span>
+<span id="737"> 737</span>
+<span id="738"> 738</span>
+<span id="739"> 739</span>
+<span id="740"> 740</span>
+<span id="741"> 741</span>
+<span id="742"> 742</span>
+<span id="743"> 743</span>
+<span id="744"> 744</span>
+<span id="745"> 745</span>
+<span id="746"> 746</span>
+<span id="747"> 747</span>
+<span id="748"> 748</span>
+<span id="749"> 749</span>
+<span id="750"> 750</span>
+<span id="751"> 751</span>
+<span id="752"> 752</span>
+<span id="753"> 753</span>
+<span id="754"> 754</span>
+<span id="755"> 755</span>
+<span id="756"> 756</span>
+<span id="757"> 757</span>
+<span id="758"> 758</span>
+<span id="759"> 759</span>
+<span id="760"> 760</span>
+<span id="761"> 761</span>
+<span id="762"> 762</span>
+<span id="763"> 763</span>
+<span id="764"> 764</span>
+<span id="765"> 765</span>
+<span id="766"> 766</span>
+<span id="767"> 767</span>
+<span id="768"> 768</span>
+<span id="769"> 769</span>
+<span id="770"> 770</span>
+<span id="771"> 771</span>
+<span id="772"> 772</span>
+<span id="773"> 773</span>
+<span id="774"> 774</span>
+<span id="775"> 775</span>
+<span id="776"> 776</span>
+<span id="777"> 777</span>
+<span id="778"> 778</span>
+<span id="779"> 779</span>
+<span id="780"> 780</span>
+<span id="781"> 781</span>
+<span id="782"> 782</span>
+<span id="783"> 783</span>
+<span id="784"> 784</span>
+<span id="785"> 785</span>
+<span id="786"> 786</span>
+<span id="787"> 787</span>
+<span id="788"> 788</span>
+<span id="789"> 789</span>
+<span id="790"> 790</span>
+<span id="791"> 791</span>
+<span id="792"> 792</span>
+<span id="793"> 793</span>
+<span id="794"> 794</span>
+<span id="795"> 795</span>
+<span id="796"> 796</span>
+<span id="797"> 797</span>
+<span id="798"> 798</span>
+<span id="799"> 799</span>
+<span id="800"> 800</span>
+<span id="801"> 801</span>
+<span id="802"> 802</span>
+<span id="803"> 803</span>
+<span id="804"> 804</span>
+<span id="805"> 805</span>
+<span id="806"> 806</span>
+<span id="807"> 807</span>
+<span id="808"> 808</span>
+<span id="809"> 809</span>
+<span id="810"> 810</span>
+<span id="811"> 811</span>
+<span id="812"> 812</span>
+<span id="813"> 813</span>
+<span id="814"> 814</span>
+<span id="815"> 815</span>
+<span id="816"> 816</span>
+<span id="817"> 817</span>
+<span id="818"> 818</span>
+<span id="819"> 819</span>
+<span id="820"> 820</span>
+<span id="821"> 821</span>
+<span id="822"> 822</span>
+<span id="823"> 823</span>
+<span id="824"> 824</span>
+<span id="825"> 825</span>
+<span id="826"> 826</span>
+<span id="827"> 827</span>
+<span id="828"> 828</span>
+<span id="829"> 829</span>
+<span id="830"> 830</span>
+<span id="831"> 831</span>
+<span id="832"> 832</span>
+<span id="833"> 833</span>
+<span id="834"> 834</span>
+<span id="835"> 835</span>
+<span id="836"> 836</span>
+<span id="837"> 837</span>
+<span id="838"> 838</span>
+<span id="839"> 839</span>
+<span id="840"> 840</span>
+<span id="841"> 841</span>
+<span id="842"> 842</span>
+<span id="843"> 843</span>
+<span id="844"> 844</span>
+<span id="845"> 845</span>
+<span id="846"> 846</span>
+<span id="847"> 847</span>
+<span id="848"> 848</span>
+<span id="849"> 849</span>
+<span id="850"> 850</span>
+<span id="851"> 851</span>
+<span id="852"> 852</span>
+<span id="853"> 853</span>
+<span id="854"> 854</span>
+<span id="855"> 855</span>
+<span id="856"> 856</span>
+<span id="857"> 857</span>
+<span id="858"> 858</span>
+<span id="859"> 859</span>
+<span id="860"> 860</span>
+<span id="861"> 861</span>
+<span id="862"> 862</span>
+<span id="863"> 863</span>
+<span id="864"> 864</span>
+<span id="865"> 865</span>
+<span id="866"> 866</span>
+<span id="867"> 867</span>
+<span id="868"> 868</span>
+<span id="869"> 869</span>
+<span id="870"> 870</span>
+<span id="871"> 871</span>
+<span id="872"> 872</span>
+<span id="873"> 873</span>
+<span id="874"> 874</span>
+<span id="875"> 875</span>
+<span id="876"> 876</span>
+<span id="877"> 877</span>
+<span id="878"> 878</span>
+<span id="879"> 879</span>
+<span id="880"> 880</span>
+<span id="881"> 881</span>
+<span id="882"> 882</span>
+<span id="883"> 883</span>
+<span id="884"> 884</span>
+<span id="885"> 885</span>
+<span id="886"> 886</span>
+<span id="887"> 887</span>
+<span id="888"> 888</span>
+<span id="889"> 889</span>
+<span id="890"> 890</span>
+<span id="891"> 891</span>
+<span id="892"> 892</span>
+<span id="893"> 893</span>
+<span id="894"> 894</span>
+<span id="895"> 895</span>
+<span id="896"> 896</span>
+<span id="897"> 897</span>
+<span id="898"> 898</span>
+<span id="899"> 899</span>
+<span id="900"> 900</span>
+<span id="901"> 901</span>
+<span id="902"> 902</span>
+<span id="903"> 903</span>
+<span id="904"> 904</span>
+<span id="905"> 905</span>
+<span id="906"> 906</span>
+<span id="907"> 907</span>
+<span id="908"> 908</span>
+<span id="909"> 909</span>
+<span id="910"> 910</span>
+<span id="911"> 911</span>
+<span id="912"> 912</span>
+<span id="913"> 913</span>
+<span id="914"> 914</span>
+<span id="915"> 915</span>
+<span id="916"> 916</span>
+<span id="917"> 917</span>
+<span id="918"> 918</span>
+<span id="919"> 919</span>
+<span id="920"> 920</span>
+<span id="921"> 921</span>
+<span id="922"> 922</span>
+<span id="923"> 923</span>
+<span id="924"> 924</span>
+<span id="925"> 925</span>
+<span id="926"> 926</span>
+<span id="927"> 927</span>
+<span id="928"> 928</span>
+<span id="929"> 929</span>
+<span id="930"> 930</span>
+<span id="931"> 931</span>
+<span id="932"> 932</span>
+<span id="933"> 933</span>
+<span id="934"> 934</span>
+<span id="935"> 935</span>
+<span id="936"> 936</span>
+<span id="937"> 937</span>
+<span id="938"> 938</span>
+<span id="939"> 939</span>
+<span id="940"> 940</span>
+<span id="941"> 941</span>
+<span id="942"> 942</span>
+<span id="943"> 943</span>
+<span id="944"> 944</span>
+<span id="945"> 945</span>
+<span id="946"> 946</span>
+<span id="947"> 947</span>
+<span id="948"> 948</span>
+<span id="949"> 949</span>
+<span id="950"> 950</span>
+<span id="951"> 951</span>
+<span id="952"> 952</span>
+<span id="953"> 953</span>
+<span id="954"> 954</span>
+<span id="955"> 955</span>
+<span id="956"> 956</span>
+<span id="957"> 957</span>
+<span id="958"> 958</span>
+<span id="959"> 959</span>
+<span id="960"> 960</span>
+<span id="961"> 961</span>
+<span id="962"> 962</span>
+<span id="963"> 963</span>
+<span id="964"> 964</span>
+<span id="965"> 965</span>
+<span id="966"> 966</span>
+<span id="967"> 967</span>
+<span id="968"> 968</span>
+<span id="969"> 969</span>
+<span id="970"> 970</span>
+<span id="971"> 971</span>
+<span id="972"> 972</span>
+<span id="973"> 973</span>
+<span id="974"> 974</span>
+<span id="975"> 975</span>
+<span id="976"> 976</span>
+<span id="977"> 977</span>
+<span id="978"> 978</span>
+<span id="979"> 979</span>
+<span id="980"> 980</span>
+<span id="981"> 981</span>
+<span id="982"> 982</span>
+<span id="983"> 983</span>
+<span id="984"> 984</span>
+<span id="985"> 985</span>
+<span id="986"> 986</span>
+<span id="987"> 987</span>
+<span id="988"> 988</span>
+<span id="989"> 989</span>
+<span id="990"> 990</span>
+<span id="991"> 991</span>
+<span id="992"> 992</span>
+<span id="993"> 993</span>
+<span id="994"> 994</span>
+<span id="995"> 995</span>
+<span id="996"> 996</span>
+<span id="997"> 997</span>
+<span id="998"> 998</span>
+<span id="999"> 999</span>
+<span id="1000">1000</span>
+<span id="1001">1001</span>
+<span id="1002">1002</span>
+<span id="1003">1003</span>
+<span id="1004">1004</span>
+<span id="1005">1005</span>
+<span id="1006">1006</span>
+<span id="1007">1007</span>
+<span id="1008">1008</span>
+<span id="1009">1009</span>
+<span id="1010">1010</span>
+<span id="1011">1011</span>
+<span id="1012">1012</span>
+<span id="1013">1013</span>
+<span id="1014">1014</span>
+<span id="1015">1015</span>
+<span id="1016">1016</span>
+<span id="1017">1017</span>
+<span id="1018">1018</span>
+<span id="1019">1019</span>
+<span id="1020">1020</span>
+<span id="1021">1021</span>
+<span id="1022">1022</span>
+<span id="1023">1023</span>
+<span id="1024">1024</span>
+<span id="1025">1025</span>
+<span id="1026">1026</span>
+<span id="1027">1027</span>
+<span id="1028">1028</span>
+<span id="1029">1029</span>
+<span id="1030">1030</span>
+<span id="1031">1031</span>
+<span id="1032">1032</span>
+<span id="1033">1033</span>
+<span id="1034">1034</span>
+<span id="1035">1035</span>
+<span id="1036">1036</span>
+<span id="1037">1037</span>
+<span id="1038">1038</span>
+<span id="1039">1039</span>
+<span id="1040">1040</span>
+<span id="1041">1041</span>
+<span id="1042">1042</span>
+<span id="1043">1043</span>
+<span id="1044">1044</span>
+<span id="1045">1045</span>
+<span id="1046">1046</span>
+<span id="1047">1047</span>
+<span id="1048">1048</span>
+<span id="1049">1049</span>
+<span id="1050">1050</span>
+<span id="1051">1051</span>
+<span id="1052">1052</span>
+<span id="1053">1053</span>
+<span id="1054">1054</span>
+<span id="1055">1055</span>
+<span id="1056">1056</span>
+<span id="1057">1057</span>
+<span id="1058">1058</span>
+<span id="1059">1059</span>
+<span id="1060">1060</span>
+<span id="1061">1061</span>
+<span id="1062">1062</span>
+<span id="1063">1063</span>
+<span id="1064">1064</span>
+<span id="1065">1065</span>
+<span id="1066">1066</span>
+<span id="1067">1067</span>
+<span id="1068">1068</span>
+<span id="1069">1069</span>
+<span id="1070">1070</span>
+<span id="1071">1071</span>
+<span id="1072">1072</span>
+<span id="1073">1073</span>
+<span id="1074">1074</span>
+<span id="1075">1075</span>
+<span id="1076">1076</span>
+<span id="1077">1077</span>
+<span id="1078">1078</span>
+<span id="1079">1079</span>
+<span id="1080">1080</span>
+<span id="1081">1081</span>
+<span id="1082">1082</span>
+<span id="1083">1083</span>
+<span id="1084">1084</span>
+<span id="1085">1085</span>
+<span id="1086">1086</span>
+<span id="1087">1087</span>
+<span id="1088">1088</span>
+<span id="1089">1089</span>
+<span id="1090">1090</span>
+<span id="1091">1091</span>
+<span id="1092">1092</span>
+<span id="1093">1093</span>
+<span id="1094">1094</span>
+<span id="1095">1095</span>
+<span id="1096">1096</span>
+<span id="1097">1097</span>
+<span id="1098">1098</span>
+<span id="1099">1099</span>
+<span id="1100">1100</span>
+<span id="1101">1101</span>
+<span id="1102">1102</span>
+<span id="1103">1103</span>
+<span id="1104">1104</span>
+<span id="1105">1105</span>
+<span id="1106">1106</span>
+<span id="1107">1107</span>
+<span id="1108">1108</span>
+<span id="1109">1109</span>
+<span id="1110">1110</span>
+<span id="1111">1111</span>
+<span id="1112">1112</span>
+<span id="1113">1113</span>
+<span id="1114">1114</span>
+<span id="1115">1115</span>
+<span id="1116">1116</span>
+<span id="1117">1117</span>
+<span id="1118">1118</span>
+<span id="1119">1119</span>
+<span id="1120">1120</span>
+<span id="1121">1121</span>
+<span id="1122">1122</span>
+<span id="1123">1123</span>
+<span id="1124">1124</span>
+<span id="1125">1125</span>
+<span id="1126">1126</span>
+<span id="1127">1127</span>
+<span id="1128">1128</span>
+<span id="1129">1129</span>
+<span id="1130">1130</span>
+<span id="1131">1131</span>
+<span id="1132">1132</span>
+<span id="1133">1133</span>
+<span id="1134">1134</span>
+<span id="1135">1135</span>
+<span id="1136">1136</span>
+<span id="1137">1137</span>
+<span id="1138">1138</span>
+<span id="1139">1139</span>
+<span id="1140">1140</span>
+<span id="1141">1141</span>
+<span id="1142">1142</span>
+<span id="1143">1143</span>
+<span id="1144">1144</span>
+<span id="1145">1145</span>
+<span id="1146">1146</span>
+<span id="1147">1147</span>
+<span id="1148">1148</span>
+<span id="1149">1149</span>
+<span id="1150">1150</span>
+<span id="1151">1151</span>
+<span id="1152">1152</span>
+<span id="1153">1153</span>
+<span id="1154">1154</span>
+<span id="1155">1155</span>
+<span id="1156">1156</span>
+<span id="1157">1157</span>
+<span id="1158">1158</span>
+<span id="1159">1159</span>
+<span id="1160">1160</span>
+<span id="1161">1161</span>
+<span id="1162">1162</span>
+<span id="1163">1163</span>
+<span id="1164">1164</span>
+<span id="1165">1165</span>
+<span id="1166">1166</span>
+<span id="1167">1167</span>
+<span id="1168">1168</span>
+<span id="1169">1169</span>
+<span id="1170">1170</span>
+<span id="1171">1171</span>
+<span id="1172">1172</span>
+<span id="1173">1173</span>
+<span id="1174">1174</span>
+<span id="1175">1175</span>
+<span id="1176">1176</span>
+<span id="1177">1177</span>
+<span id="1178">1178</span>
+<span id="1179">1179</span>
+<span id="1180">1180</span>
+<span id="1181">1181</span>
+<span id="1182">1182</span>
+<span id="1183">1183</span>
+<span id="1184">1184</span>
+<span id="1185">1185</span>
+<span id="1186">1186</span>
+<span id="1187">1187</span>
+<span id="1188">1188</span>
+<span id="1189">1189</span>
+<span id="1190">1190</span>
+<span id="1191">1191</span>
+<span id="1192">1192</span>
+<span id="1193">1193</span>
+<span id="1194">1194</span>
+<span id="1195">1195</span>
+<span id="1196">1196</span>
+<span id="1197">1197</span>
+<span id="1198">1198</span>
+<span id="1199">1199</span>
+<span id="1200">1200</span>
+<span id="1201">1201</span>
+<span id="1202">1202</span>
+<span id="1203">1203</span>
+<span id="1204">1204</span>
+<span id="1205">1205</span>
+<span id="1206">1206</span>
+<span id="1207">1207</span>
+<span id="1208">1208</span>
+<span id="1209">1209</span>
+<span id="1210">1210</span>
+<span id="1211">1211</span>
+<span id="1212">1212</span>
+<span id="1213">1213</span>
+<span id="1214">1214</span>
+<span id="1215">1215</span>
+<span id="1216">1216</span>
+<span id="1217">1217</span>
+<span id="1218">1218</span>
+<span id="1219">1219</span>
+<span id="1220">1220</span>
+<span id="1221">1221</span>
+<span id="1222">1222</span>
+<span id="1223">1223</span>
+<span id="1224">1224</span>
+<span id="1225">1225</span>
+<span id="1226">1226</span>
+<span id="1227">1227</span>
+<span id="1228">1228</span>
+<span id="1229">1229</span>
+<span id="1230">1230</span>
+<span id="1231">1231</span>
+<span id="1232">1232</span>
+<span id="1233">1233</span>
+<span id="1234">1234</span>
+<span id="1235">1235</span>
+<span id="1236">1236</span>
+<span id="1237">1237</span>
+<span id="1238">1238</span>
+<span id="1239">1239</span>
+<span id="1240">1240</span>
+<span id="1241">1241</span>
+<span id="1242">1242</span>
+<span id="1243">1243</span>
+<span id="1244">1244</span>
+<span id="1245">1245</span>
+<span id="1246">1246</span>
+<span id="1247">1247</span>
+<span id="1248">1248</span>
+<span id="1249">1249</span>
+<span id="1250">1250</span>
+<span id="1251">1251</span>
+<span id="1252">1252</span>
+<span id="1253">1253</span>
+<span id="1254">1254</span>
+<span id="1255">1255</span>
+<span id="1256">1256</span>
+<span id="1257">1257</span>
+<span id="1258">1258</span>
+<span id="1259">1259</span>
+<span id="1260">1260</span>
+<span id="1261">1261</span>
+<span id="1262">1262</span>
+<span id="1263">1263</span>
+<span id="1264">1264</span>
+<span id="1265">1265</span>
+<span id="1266">1266</span>
+<span id="1267">1267</span>
+<span id="1268">1268</span>
+<span id="1269">1269</span>
+<span id="1270">1270</span>
+<span id="1271">1271</span>
+<span id="1272">1272</span>
+<span id="1273">1273</span>
+<span id="1274">1274</span>
+<span id="1275">1275</span>
+<span id="1276">1276</span>
+<span id="1277">1277</span>
+<span id="1278">1278</span>
+<span id="1279">1279</span>
+<span id="1280">1280</span>
+<span id="1281">1281</span>
+<span id="1282">1282</span>
+<span id="1283">1283</span>
+<span id="1284">1284</span>
+<span id="1285">1285</span>
+<span id="1286">1286</span>
+<span id="1287">1287</span>
+<span id="1288">1288</span>
+<span id="1289">1289</span>
+<span id="1290">1290</span>
+<span id="1291">1291</span>
+<span id="1292">1292</span>
+<span id="1293">1293</span>
+<span id="1294">1294</span>
+<span id="1295">1295</span>
+<span id="1296">1296</span>
+<span id="1297">1297</span>
+<span id="1298">1298</span>
+<span id="1299">1299</span>
+<span id="1300">1300</span>
+<span id="1301">1301</span>
+<span id="1302">1302</span>
+<span id="1303">1303</span>
+<span id="1304">1304</span>
+<span id="1305">1305</span>
+<span id="1306">1306</span>
+<span id="1307">1307</span>
+<span id="1308">1308</span>
+<span id="1309">1309</span>
+<span id="1310">1310</span>
+<span id="1311">1311</span>
+<span id="1312">1312</span>
+<span id="1313">1313</span>
+<span id="1314">1314</span>
+<span id="1315">1315</span>
+<span id="1316">1316</span>
+<span id="1317">1317</span>
+<span id="1318">1318</span>
+<span id="1319">1319</span>
+<span id="1320">1320</span>
+<span id="1321">1321</span>
+<span id="1322">1322</span>
+<span id="1323">1323</span>
+<span id="1324">1324</span>
+<span id="1325">1325</span>
+<span id="1326">1326</span>
+<span id="1327">1327</span>
+<span id="1328">1328</span>
+<span id="1329">1329</span>
+<span id="1330">1330</span>
+<span id="1331">1331</span>
+<span id="1332">1332</span>
+<span id="1333">1333</span>
+<span id="1334">1334</span>
+<span id="1335">1335</span>
+<span id="1336">1336</span>
+<span id="1337">1337</span>
+<span id="1338">1338</span>
+<span id="1339">1339</span>
+<span id="1340">1340</span>
+<span id="1341">1341</span>
+<span id="1342">1342</span>
+<span id="1343">1343</span>
+<span id="1344">1344</span>
+<span id="1345">1345</span>
+<span id="1346">1346</span>
+<span id="1347">1347</span>
+<span id="1348">1348</span>
+<span id="1349">1349</span>
+<span id="1350">1350</span>
+<span id="1351">1351</span>
+<span id="1352">1352</span>
+<span id="1353">1353</span>
+<span id="1354">1354</span>
+<span id="1355">1355</span>
+<span id="1356">1356</span>
+<span id="1357">1357</span>
+<span id="1358">1358</span>
+<span id="1359">1359</span>
+<span id="1360">1360</span>
+<span id="1361">1361</span>
+<span id="1362">1362</span>
+<span id="1363">1363</span>
+<span id="1364">1364</span>
+<span id="1365">1365</span>
+<span id="1366">1366</span>
+<span id="1367">1367</span>
+<span id="1368">1368</span>
+<span id="1369">1369</span>
+<span id="1370">1370</span>
+<span id="1371">1371</span>
+<span id="1372">1372</span>
+<span id="1373">1373</span>
+<span id="1374">1374</span>
+<span id="1375">1375</span>
+<span id="1376">1376</span>
+<span id="1377">1377</span>
+<span id="1378">1378</span>
+<span id="1379">1379</span>
+<span id="1380">1380</span>
+<span id="1381">1381</span>
+<span id="1382">1382</span>
+<span id="1383">1383</span>
+<span id="1384">1384</span>
+<span id="1385">1385</span>
+<span id="1386">1386</span>
+<span id="1387">1387</span>
+<span id="1388">1388</span>
+<span id="1389">1389</span>
+<span id="1390">1390</span>
+<span id="1391">1391</span>
+<span id="1392">1392</span>
+<span id="1393">1393</span>
+<span id="1394">1394</span>
+<span id="1395">1395</span>
+<span id="1396">1396</span>
+<span id="1397">1397</span>
+<span id="1398">1398</span>
+<span id="1399">1399</span>
+<span id="1400">1400</span>
+<span id="1401">1401</span>
+<span id="1402">1402</span>
+<span id="1403">1403</span>
+<span id="1404">1404</span>
+<span id="1405">1405</span>
+<span id="1406">1406</span>
+<span id="1407">1407</span>
+<span id="1408">1408</span>
+<span id="1409">1409</span>
+<span id="1410">1410</span>
+<span id="1411">1411</span>
+<span id="1412">1412</span>
+<span id="1413">1413</span>
+<span id="1414">1414</span>
+<span id="1415">1415</span>
+<span id="1416">1416</span>
+<span id="1417">1417</span>
+<span id="1418">1418</span>
+<span id="1419">1419</span>
+<span id="1420">1420</span>
+<span id="1421">1421</span>
+<span id="1422">1422</span>
+<span id="1423">1423</span>
+<span id="1424">1424</span>
+<span id="1425">1425</span>
+<span id="1426">1426</span>
+<span id="1427">1427</span>
+<span id="1428">1428</span>
+<span id="1429">1429</span>
+<span id="1430">1430</span>
+<span id="1431">1431</span>
+<span id="1432">1432</span>
+<span id="1433">1433</span>
+<span id="1434">1434</span>
+<span id="1435">1435</span>
+<span id="1436">1436</span>
+<span id="1437">1437</span>
+<span id="1438">1438</span>
+<span id="1439">1439</span>
+<span id="1440">1440</span>
+<span id="1441">1441</span>
+<span id="1442">1442</span>
+<span id="1443">1443</span>
+<span id="1444">1444</span>
+<span id="1445">1445</span>
+<span id="1446">1446</span>
+<span id="1447">1447</span>
+<span id="1448">1448</span>
+<span id="1449">1449</span>
+<span id="1450">1450</span>
+<span id="1451">1451</span>
+<span id="1452">1452</span>
+<span id="1453">1453</span>
+<span id="1454">1454</span>
+<span id="1455">1455</span>
+<span id="1456">1456</span>
+<span id="1457">1457</span>
+<span id="1458">1458</span>
+<span id="1459">1459</span>
+<span id="1460">1460</span>
+<span id="1461">1461</span>
+<span id="1462">1462</span>
+<span id="1463">1463</span>
+<span id="1464">1464</span>
+<span id="1465">1465</span>
+<span id="1466">1466</span>
+<span id="1467">1467</span>
+<span id="1468">1468</span>
+<span id="1469">1469</span>
+<span id="1470">1470</span>
+<span id="1471">1471</span>
+<span id="1472">1472</span>
+<span id="1473">1473</span>
+<span id="1474">1474</span>
+<span id="1475">1475</span>
+<span id="1476">1476</span>
+<span id="1477">1477</span>
+<span id="1478">1478</span>
+<span id="1479">1479</span>
+<span id="1480">1480</span>
+<span id="1481">1481</span>
+<span id="1482">1482</span>
+<span id="1483">1483</span>
+<span id="1484">1484</span>
+<span id="1485">1485</span>
+<span id="1486">1486</span>
+<span id="1487">1487</span>
+<span id="1488">1488</span>
+<span id="1489">1489</span>
+<span id="1490">1490</span>
+<span id="1491">1491</span>
+<span id="1492">1492</span>
+<span id="1493">1493</span>
+<span id="1494">1494</span>
+<span id="1495">1495</span>
+<span id="1496">1496</span>
+<span id="1497">1497</span>
+<span id="1498">1498</span>
+<span id="1499">1499</span>
+<span id="1500">1500</span>
+<span id="1501">1501</span>
+<span id="1502">1502</span>
+<span id="1503">1503</span>
+<span id="1504">1504</span>
+<span id="1505">1505</span>
+<span id="1506">1506</span>
+<span id="1507">1507</span>
+<span id="1508">1508</span>
+<span id="1509">1509</span>
+<span id="1510">1510</span>
+<span id="1511">1511</span>
+<span id="1512">1512</span>
+<span id="1513">1513</span>
+<span id="1514">1514</span>
+<span id="1515">1515</span>
+<span id="1516">1516</span>
+<span id="1517">1517</span>
+<span id="1518">1518</span>
+<span id="1519">1519</span>
+<span id="1520">1520</span>
+<span id="1521">1521</span>
+<span id="1522">1522</span>
+<span id="1523">1523</span>
+<span id="1524">1524</span>
+<span id="1525">1525</span>
+<span id="1526">1526</span>
+<span id="1527">1527</span>
+<span id="1528">1528</span>
+<span id="1529">1529</span>
+<span id="1530">1530</span>
+<span id="1531">1531</span>
+<span id="1532">1532</span>
+<span id="1533">1533</span>
+<span id="1534">1534</span>
+<span id="1535">1535</span>
+<span id="1536">1536</span>
+<span id="1537">1537</span>
+<span id="1538">1538</span>
+<span id="1539">1539</span>
+<span id="1540">1540</span>
+<span id="1541">1541</span>
+<span id="1542">1542</span>
+<span id="1543">1543</span>
+<span id="1544">1544</span>
+<span id="1545">1545</span>
+<span id="1546">1546</span>
+<span id="1547">1547</span>
+<span id="1548">1548</span>
+<span id="1549">1549</span>
+<span id="1550">1550</span>
+<span id="1551">1551</span>
+<span id="1552">1552</span>
+<span id="1553">1553</span>
+<span id="1554">1554</span>
+<span id="1555">1555</span>
+<span id="1556">1556</span>
+<span id="1557">1557</span>
+<span id="1558">1558</span>
+<span id="1559">1559</span>
+<span id="1560">1560</span>
+<span id="1561">1561</span>
+<span id="1562">1562</span>
+<span id="1563">1563</span>
+<span id="1564">1564</span>
+<span id="1565">1565</span>
+<span id="1566">1566</span>
+<span id="1567">1567</span>
+<span id="1568">1568</span>
+<span id="1569">1569</span>
+<span id="1570">1570</span>
+<span id="1571">1571</span>
+<span id="1572">1572</span>
+<span id="1573">1573</span>
+<span id="1574">1574</span>
+<span id="1575">1575</span>
+<span id="1576">1576</span>
+<span id="1577">1577</span>
+<span id="1578">1578</span>
+<span id="1579">1579</span>
+<span id="1580">1580</span>
+<span id="1581">1581</span>
+<span id="1582">1582</span>
+<span id="1583">1583</span>
+<span id="1584">1584</span>
+<span id="1585">1585</span>
+<span id="1586">1586</span>
+<span id="1587">1587</span>
+<span id="1588">1588</span>
+<span id="1589">1589</span>
+<span id="1590">1590</span>
+<span id="1591">1591</span>
+<span id="1592">1592</span>
+<span id="1593">1593</span>
+<span id="1594">1594</span>
+<span id="1595">1595</span>
+<span id="1596">1596</span>
+<span id="1597">1597</span>
+<span id="1598">1598</span>
+<span id="1599">1599</span>
+<span id="1600">1600</span>
+<span id="1601">1601</span>
+<span id="1602">1602</span>
+<span id="1603">1603</span>
+<span id="1604">1604</span>
+<span id="1605">1605</span>
+<span id="1606">1606</span>
+<span id="1607">1607</span>
+<span id="1608">1608</span>
+<span id="1609">1609</span>
+<span id="1610">1610</span>
+<span id="1611">1611</span>
+<span id="1612">1612</span>
+<span id="1613">1613</span>
+<span id="1614">1614</span>
+<span id="1615">1615</span>
+<span id="1616">1616</span>
+<span id="1617">1617</span>
+<span id="1618">1618</span>
+<span id="1619">1619</span>
+<span id="1620">1620</span>
+<span id="1621">1621</span>
+<span id="1622">1622</span>
+<span id="1623">1623</span>
+<span id="1624">1624</span>
+<span id="1625">1625</span>
+<span id="1626">1626</span>
+<span id="1627">1627</span>
+<span id="1628">1628</span>
+<span id="1629">1629</span>
+<span id="1630">1630</span>
+<span id="1631">1631</span>
+<span id="1632">1632</span>
+<span id="1633">1633</span>
+<span id="1634">1634</span>
+<span id="1635">1635</span>
+<span id="1636">1636</span>
+<span id="1637">1637</span>
+<span id="1638">1638</span>
+<span id="1639">1639</span>
+<span id="1640">1640</span>
+<span id="1641">1641</span>
+<span id="1642">1642</span>
+<span id="1643">1643</span>
+<span id="1644">1644</span>
+<span id="1645">1645</span>
+<span id="1646">1646</span>
+<span id="1647">1647</span>
+<span id="1648">1648</span>
+<span id="1649">1649</span>
+<span id="1650">1650</span>
+<span id="1651">1651</span>
+<span id="1652">1652</span>
+<span id="1653">1653</span>
+<span id="1654">1654</span>
+<span id="1655">1655</span>
+<span id="1656">1656</span>
+<span id="1657">1657</span>
+<span id="1658">1658</span>
+<span id="1659">1659</span>
+<span id="1660">1660</span>
+<span id="1661">1661</span>
+<span id="1662">1662</span>
+<span id="1663">1663</span>
+<span id="1664">1664</span>
+<span id="1665">1665</span>
+<span id="1666">1666</span>
+<span id="1667">1667</span>
+<span id="1668">1668</span>
+<span id="1669">1669</span>
+<span id="1670">1670</span>
+<span id="1671">1671</span>
+<span id="1672">1672</span>
+<span id="1673">1673</span>
+<span id="1674">1674</span>
+<span id="1675">1675</span>
+<span id="1676">1676</span>
+<span id="1677">1677</span>
+<span id="1678">1678</span>
+<span id="1679">1679</span>
+<span id="1680">1680</span>
+<span id="1681">1681</span>
+<span id="1682">1682</span>
+<span id="1683">1683</span>
+<span id="1684">1684</span>
+<span id="1685">1685</span>
+<span id="1686">1686</span>
+<span id="1687">1687</span>
+<span id="1688">1688</span>
+<span id="1689">1689</span>
+<span id="1690">1690</span>
+<span id="1691">1691</span>
+<span id="1692">1692</span>
+<span id="1693">1693</span>
+<span id="1694">1694</span>
+<span id="1695">1695</span>
+<span id="1696">1696</span>
+<span id="1697">1697</span>
+<span id="1698">1698</span>
+<span id="1699">1699</span>
+<span id="1700">1700</span>
+<span id="1701">1701</span>
+<span id="1702">1702</span>
+<span id="1703">1703</span>
+<span id="1704">1704</span>
+<span id="1705">1705</span>
+<span id="1706">1706</span>
+<span id="1707">1707</span>
+<span id="1708">1708</span>
+<span id="1709">1709</span>
+<span id="1710">1710</span>
+<span id="1711">1711</span>
+<span id="1712">1712</span>
+<span id="1713">1713</span>
+<span id="1714">1714</span>
+<span id="1715">1715</span>
+<span id="1716">1716</span>
+<span id="1717">1717</span>
+<span id="1718">1718</span>
+<span id="1719">1719</span>
+<span id="1720">1720</span>
+<span id="1721">1721</span>
+<span id="1722">1722</span>
+<span id="1723">1723</span>
+<span id="1724">1724</span>
+<span id="1725">1725</span>
+<span id="1726">1726</span>
+<span id="1727">1727</span>
+<span id="1728">1728</span>
+<span id="1729">1729</span>
+<span id="1730">1730</span>
+<span id="1731">1731</span>
+<span id="1732">1732</span>
+<span id="1733">1733</span>
+<span id="1734">1734</span>
+<span id="1735">1735</span>
+<span id="1736">1736</span>
+<span id="1737">1737</span>
+<span id="1738">1738</span>
+<span id="1739">1739</span>
+<span id="1740">1740</span>
+<span id="1741">1741</span>
+<span id="1742">1742</span>
+<span id="1743">1743</span>
+<span id="1744">1744</span>
+<span id="1745">1745</span>
+<span id="1746">1746</span>
+<span id="1747">1747</span>
+<span id="1748">1748</span>
+<span id="1749">1749</span>
+<span id="1750">1750</span>
+<span id="1751">1751</span>
+<span id="1752">1752</span>
+<span id="1753">1753</span>
+<span id="1754">1754</span>
+<span id="1755">1755</span>
+<span id="1756">1756</span>
+<span id="1757">1757</span>
+<span id="1758">1758</span>
+<span id="1759">1759</span>
+<span id="1760">1760</span>
+<span id="1761">1761</span>
+<span id="1762">1762</span>
+<span id="1763">1763</span>
+<span id="1764">1764</span>
+<span id="1765">1765</span>
+<span id="1766">1766</span>
+<span id="1767">1767</span>
+<span id="1768">1768</span>
+<span id="1769">1769</span>
+<span id="1770">1770</span>
+<span id="1771">1771</span>
+<span id="1772">1772</span>
+<span id="1773">1773</span>
+<span id="1774">1774</span>
+<span id="1775">1775</span>
+<span id="1776">1776</span>
+<span id="1777">1777</span>
+<span id="1778">1778</span>
+<span id="1779">1779</span>
+<span id="1780">1780</span>
+<span id="1781">1781</span>
+<span id="1782">1782</span>
+<span id="1783">1783</span>
+<span id="1784">1784</span>
+<span id="1785">1785</span>
+<span id="1786">1786</span>
+<span id="1787">1787</span>
+<span id="1788">1788</span>
+<span id="1789">1789</span>
+<span id="1790">1790</span>
+<span id="1791">1791</span>
+<span id="1792">1792</span>
+<span id="1793">1793</span>
+<span id="1794">1794</span>
+<span id="1795">1795</span>
+<span id="1796">1796</span>
+<span id="1797">1797</span>
+<span id="1798">1798</span>
+<span id="1799">1799</span>
+<span id="1800">1800</span>
+<span id="1801">1801</span>
+<span id="1802">1802</span>
+<span id="1803">1803</span>
+<span id="1804">1804</span>
+<span id="1805">1805</span>
+<span id="1806">1806</span>
+<span id="1807">1807</span>
+<span id="1808">1808</span>
+<span id="1809">1809</span>
+<span id="1810">1810</span>
+<span id="1811">1811</span>
+<span id="1812">1812</span>
+<span id="1813">1813</span>
+<span id="1814">1814</span>
+<span id="1815">1815</span>
+<span id="1816">1816</span>
+<span id="1817">1817</span>
+<span id="1818">1818</span>
+<span id="1819">1819</span>
+<span id="1820">1820</span>
+<span id="1821">1821</span>
+<span id="1822">1822</span>
+<span id="1823">1823</span>
+<span id="1824">1824</span>
+<span id="1825">1825</span>
+<span id="1826">1826</span>
+<span id="1827">1827</span>
+<span id="1828">1828</span>
+<span id="1829">1829</span>
+<span id="1830">1830</span>
+<span id="1831">1831</span>
+<span id="1832">1832</span>
+<span id="1833">1833</span>
+<span id="1834">1834</span>
+<span id="1835">1835</span>
+<span id="1836">1836</span>
+<span id="1837">1837</span>
+<span id="1838">1838</span>
+<span id="1839">1839</span>
+<span id="1840">1840</span>
+<span id="1841">1841</span>
+<span id="1842">1842</span>
+<span id="1843">1843</span>
+<span id="1844">1844</span>
+<span id="1845">1845</span>
+<span id="1846">1846</span>
+<span id="1847">1847</span>
+<span id="1848">1848</span>
+<span id="1849">1849</span>
+<span id="1850">1850</span>
+<span id="1851">1851</span>
+<span id="1852">1852</span>
+<span id="1853">1853</span>
+<span id="1854">1854</span>
+<span id="1855">1855</span>
+<span id="1856">1856</span>
+<span id="1857">1857</span>
+<span id="1858">1858</span>
+<span id="1859">1859</span>
+<span id="1860">1860</span>
+<span id="1861">1861</span>
+<span id="1862">1862</span>
+<span id="1863">1863</span>
+<span id="1864">1864</span>
+<span id="1865">1865</span>
+<span id="1866">1866</span>
+<span id="1867">1867</span>
+<span id="1868">1868</span>
+<span id="1869">1869</span>
+<span id="1870">1870</span>
+<span id="1871">1871</span>
+<span id="1872">1872</span>
+<span id="1873">1873</span>
+<span id="1874">1874</span>
+<span id="1875">1875</span>
+<span id="1876">1876</span>
+<span id="1877">1877</span>
+<span id="1878">1878</span>
+<span id="1879">1879</span>
+<span id="1880">1880</span>
+<span id="1881">1881</span>
+<span id="1882">1882</span>
+<span id="1883">1883</span>
+<span id="1884">1884</span>
+<span id="1885">1885</span>
+<span id="1886">1886</span>
+<span id="1887">1887</span>
+<span id="1888">1888</span>
+<span id="1889">1889</span>
+<span id="1890">1890</span>
+<span id="1891">1891</span>
+<span id="1892">1892</span>
+<span id="1893">1893</span>
+<span id="1894">1894</span>
+<span id="1895">1895</span>
+<span id="1896">1896</span>
+<span id="1897">1897</span>
+<span id="1898">1898</span>
+<span id="1899">1899</span>
+<span id="1900">1900</span>
+<span id="1901">1901</span>
+<span id="1902">1902</span>
+<span id="1903">1903</span>
+<span id="1904">1904</span>
+<span id="1905">1905</span>
+<span id="1906">1906</span>
+<span id="1907">1907</span>
+<span id="1908">1908</span>
+<span id="1909">1909</span>
+<span id="1910">1910</span>
+<span id="1911">1911</span>
+<span id="1912">1912</span>
+<span id="1913">1913</span>
+<span id="1914">1914</span>
+<span id="1915">1915</span>
+<span id="1916">1916</span>
+<span id="1917">1917</span>
+<span id="1918">1918</span>
+<span id="1919">1919</span>
+<span id="1920">1920</span>
+<span id="1921">1921</span>
+<span id="1922">1922</span>
+<span id="1923">1923</span>
+<span id="1924">1924</span>
+<span id="1925">1925</span>
+<span id="1926">1926</span>
+<span id="1927">1927</span>
+<span id="1928">1928</span>
+<span id="1929">1929</span>
+<span id="1930">1930</span>
+<span id="1931">1931</span>
+<span id="1932">1932</span>
+<span id="1933">1933</span>
+<span id="1934">1934</span>
+<span id="1935">1935</span>
+<span id="1936">1936</span>
+<span id="1937">1937</span>
+<span id="1938">1938</span>
+<span id="1939">1939</span>
+<span id="1940">1940</span>
+<span id="1941">1941</span>
+<span id="1942">1942</span>
+<span id="1943">1943</span>
+<span id="1944">1944</span>
+<span id="1945">1945</span>
+<span id="1946">1946</span>
+<span id="1947">1947</span>
+<span id="1948">1948</span>
+<span id="1949">1949</span>
+<span id="1950">1950</span>
+<span id="1951">1951</span>
+<span id="1952">1952</span>
+<span id="1953">1953</span>
+<span id="1954">1954</span>
+<span id="1955">1955</span>
+<span id="1956">1956</span>
+<span id="1957">1957</span>
+<span id="1958">1958</span>
+<span id="1959">1959</span>
+<span id="1960">1960</span>
+<span id="1961">1961</span>
+<span id="1962">1962</span>
+<span id="1963">1963</span>
+<span id="1964">1964</span>
+<span id="1965">1965</span>
+<span id="1966">1966</span>
+<span id="1967">1967</span>
+<span id="1968">1968</span>
+<span id="1969">1969</span>
+<span id="1970">1970</span>
+<span id="1971">1971</span>
+<span id="1972">1972</span>
+<span id="1973">1973</span>
+<span id="1974">1974</span>
+<span id="1975">1975</span>
+<span id="1976">1976</span>
+<span id="1977">1977</span>
+<span id="1978">1978</span>
+<span id="1979">1979</span>
+<span id="1980">1980</span>
+<span id="1981">1981</span>
+<span id="1982">1982</span>
+<span id="1983">1983</span>
+<span id="1984">1984</span>
+<span id="1985">1985</span>
+<span id="1986">1986</span>
+<span id="1987">1987</span>
+<span id="1988">1988</span>
+<span id="1989">1989</span>
+<span id="1990">1990</span>
+<span id="1991">1991</span>
+<span id="1992">1992</span>
+<span id="1993">1993</span>
+<span id="1994">1994</span>
+<span id="1995">1995</span>
+<span id="1996">1996</span>
+<span id="1997">1997</span>
+<span id="1998">1998</span>
+<span id="1999">1999</span>
+<span id="2000">2000</span>
+<span id="2001">2001</span>
+<span id="2002">2002</span>
+<span id="2003">2003</span>
+<span id="2004">2004</span>
+<span id="2005">2005</span>
+<span id="2006">2006</span>
+<span id="2007">2007</span>
+<span id="2008">2008</span>
+<span id="2009">2009</span>
+<span id="2010">2010</span>
+<span id="2011">2011</span>
+<span id="2012">2012</span>
+<span id="2013">2013</span>
+<span id="2014">2014</span>
+<span id="2015">2015</span>
+<span id="2016">2016</span>
+<span id="2017">2017</span>
+<span id="2018">2018</span>
+<span id="2019">2019</span>
+<span id="2020">2020</span>
+<span id="2021">2021</span>
+<span id="2022">2022</span>
+<span id="2023">2023</span>
+<span id="2024">2024</span>
+<span id="2025">2025</span>
+<span id="2026">2026</span>
+<span id="2027">2027</span>
+<span id="2028">2028</span>
+<span id="2029">2029</span>
+<span id="2030">2030</span>
+<span id="2031">2031</span>
+<span id="2032">2032</span>
+<span id="2033">2033</span>
+<span id="2034">2034</span>
+<span id="2035">2035</span>
+<span id="2036">2036</span>
+<span id="2037">2037</span>
+<span id="2038">2038</span>
+<span id="2039">2039</span>
+<span id="2040">2040</span>
+<span id="2041">2041</span>
+<span id="2042">2042</span>
+<span id="2043">2043</span>
+<span id="2044">2044</span>
+<span id="2045">2045</span>
+<span id="2046">2046</span>
+<span id="2047">2047</span>
+<span id="2048">2048</span>
+<span id="2049">2049</span>
+<span id="2050">2050</span>
+<span id="2051">2051</span>
+<span id="2052">2052</span>
+<span id="2053">2053</span>
+<span id="2054">2054</span>
+<span id="2055">2055</span>
+<span id="2056">2056</span>
+<span id="2057">2057</span>
+<span id="2058">2058</span>
+<span id="2059">2059</span>
+<span id="2060">2060</span>
+<span id="2061">2061</span>
+<span id="2062">2062</span>
+<span id="2063">2063</span>
+<span id="2064">2064</span>
+<span id="2065">2065</span>
+<span id="2066">2066</span>
+<span id="2067">2067</span>
+<span id="2068">2068</span>
+<span id="2069">2069</span>
+<span id="2070">2070</span>
+<span id="2071">2071</span>
+<span id="2072">2072</span>
+<span id="2073">2073</span>
+<span id="2074">2074</span>
+<span id="2075">2075</span>
+<span id="2076">2076</span>
+<span id="2077">2077</span>
+<span id="2078">2078</span>
+<span id="2079">2079</span>
+<span id="2080">2080</span>
+<span id="2081">2081</span>
+<span id="2082">2082</span>
+<span id="2083">2083</span>
+<span id="2084">2084</span>
+<span id="2085">2085</span>
+<span id="2086">2086</span>
+<span id="2087">2087</span>
+<span id="2088">2088</span>
+<span id="2089">2089</span>
+<span id="2090">2090</span>
+<span id="2091">2091</span>
+<span id="2092">2092</span>
+<span id="2093">2093</span>
+<span id="2094">2094</span>
+<span id="2095">2095</span>
+<span id="2096">2096</span>
+<span id="2097">2097</span>
+<span id="2098">2098</span>
+<span id="2099">2099</span>
+<span id="2100">2100</span>
+<span id="2101">2101</span>
+<span id="2102">2102</span>
+<span id="2103">2103</span>
+<span id="2104">2104</span>
+<span id="2105">2105</span>
+<span id="2106">2106</span>
+<span id="2107">2107</span>
+<span id="2108">2108</span>
+<span id="2109">2109</span>
+<span id="2110">2110</span>
+<span id="2111">2111</span>
+<span id="2112">2112</span>
+<span id="2113">2113</span>
+<span id="2114">2114</span>
+<span id="2115">2115</span>
+<span id="2116">2116</span>
+<span id="2117">2117</span>
+<span id="2118">2118</span>
+<span id="2119">2119</span>
+<span id="2120">2120</span>
+<span id="2121">2121</span>
+<span id="2122">2122</span>
+<span id="2123">2123</span>
+<span id="2124">2124</span>
+<span id="2125">2125</span>
+<span id="2126">2126</span>
+<span id="2127">2127</span>
+<span id="2128">2128</span>
+<span id="2129">2129</span>
+<span id="2130">2130</span>
+<span id="2131">2131</span>
+<span id="2132">2132</span>
+<span id="2133">2133</span>
+<span id="2134">2134</span>
+<span id="2135">2135</span>
+<span id="2136">2136</span>
+<span id="2137">2137</span>
+<span id="2138">2138</span>
+<span id="2139">2139</span>
+<span id="2140">2140</span>
+<span id="2141">2141</span>
+<span id="2142">2142</span>
+<span id="2143">2143</span>
+<span id="2144">2144</span>
+<span id="2145">2145</span>
+<span id="2146">2146</span>
+<span id="2147">2147</span>
+<span id="2148">2148</span>
+<span id="2149">2149</span>
+<span id="2150">2150</span>
+<span id="2151">2151</span>
+<span id="2152">2152</span>
+<span id="2153">2153</span>
+<span id="2154">2154</span>
+<span id="2155">2155</span>
+<span id="2156">2156</span>
+<span id="2157">2157</span>
+<span id="2158">2158</span>
+<span id="2159">2159</span>
+<span id="2160">2160</span>
+<span id="2161">2161</span>
+<span id="2162">2162</span>
+<span id="2163">2163</span>
+<span id="2164">2164</span>
+<span id="2165">2165</span>
+<span id="2166">2166</span>
+<span id="2167">2167</span>
+<span id="2168">2168</span>
+<span id="2169">2169</span>
+<span id="2170">2170</span>
+<span id="2171">2171</span>
+<span id="2172">2172</span>
+<span id="2173">2173</span>
+<span id="2174">2174</span>
+<span id="2175">2175</span>
+<span id="2176">2176</span>
+<span id="2177">2177</span>
+<span id="2178">2178</span>
+<span id="2179">2179</span>
+<span id="2180">2180</span>
+<span id="2181">2181</span>
+<span id="2182">2182</span>
+<span id="2183">2183</span>
+<span id="2184">2184</span>
+<span id="2185">2185</span>
+<span id="2186">2186</span>
+<span id="2187">2187</span>
+<span id="2188">2188</span>
+<span id="2189">2189</span>
+<span id="2190">2190</span>
+<span id="2191">2191</span>
+<span id="2192">2192</span>
+<span id="2193">2193</span>
+<span id="2194">2194</span>
+<span id="2195">2195</span>
+<span id="2196">2196</span>
+<span id="2197">2197</span>
+<span id="2198">2198</span>
+<span id="2199">2199</span>
+<span id="2200">2200</span>
+<span id="2201">2201</span>
+<span id="2202">2202</span>
+<span id="2203">2203</span>
+<span id="2204">2204</span>
+<span id="2205">2205</span>
+<span id="2206">2206</span>
+<span id="2207">2207</span>
+<span id="2208">2208</span>
+<span id="2209">2209</span>
+<span id="2210">2210</span>
+<span id="2211">2211</span>
+<span id="2212">2212</span>
+<span id="2213">2213</span>
+<span id="2214">2214</span>
+<span id="2215">2215</span>
+<span id="2216">2216</span>
+<span id="2217">2217</span>
+<span id="2218">2218</span>
+<span id="2219">2219</span>
+<span id="2220">2220</span>
+<span id="2221">2221</span>
+<span id="2222">2222</span>
+<span id="2223">2223</span>
+<span id="2224">2224</span>
+<span id="2225">2225</span>
+<span id="2226">2226</span>
+<span id="2227">2227</span>
+<span id="2228">2228</span>
+<span id="2229">2229</span>
+<span id="2230">2230</span>
+<span id="2231">2231</span>
+<span id="2232">2232</span>
+<span id="2233">2233</span>
+<span id="2234">2234</span>
+<span id="2235">2235</span>
+<span id="2236">2236</span>
+<span id="2237">2237</span>
+<span id="2238">2238</span>
+<span id="2239">2239</span>
+<span id="2240">2240</span>
+<span id="2241">2241</span>
+<span id="2242">2242</span>
+<span id="2243">2243</span>
+<span id="2244">2244</span>
+<span id="2245">2245</span>
+<span id="2246">2246</span>
+<span id="2247">2247</span>
+<span id="2248">2248</span>
+<span id="2249">2249</span>
+<span id="2250">2250</span>
+<span id="2251">2251</span>
+<span id="2252">2252</span>
+<span id="2253">2253</span>
+<span id="2254">2254</span>
+<span id="2255">2255</span>
+<span id="2256">2256</span>
+<span id="2257">2257</span>
+<span id="2258">2258</span>
+<span id="2259">2259</span>
+<span id="2260">2260</span>
+<span id="2261">2261</span>
+<span id="2262">2262</span>
+<span id="2263">2263</span>
+<span id="2264">2264</span>
+<span id="2265">2265</span>
+<span id="2266">2266</span>
+<span id="2267">2267</span>
+<span id="2268">2268</span>
+<span id="2269">2269</span>
+<span id="2270">2270</span>
+<span id="2271">2271</span>
+<span id="2272">2272</span>
+<span id="2273">2273</span>
+<span id="2274">2274</span>
+<span id="2275">2275</span>
+<span id="2276">2276</span>
+<span id="2277">2277</span>
+<span id="2278">2278</span>
+<span id="2279">2279</span>
+<span id="2280">2280</span>
+<span id="2281">2281</span>
+<span id="2282">2282</span>
+<span id="2283">2283</span>
+<span id="2284">2284</span>
+<span id="2285">2285</span>
+<span id="2286">2286</span>
+<span id="2287">2287</span>
+<span id="2288">2288</span>
+<span id="2289">2289</span>
+<span id="2290">2290</span>
+<span id="2291">2291</span>
+<span id="2292">2292</span>
+<span id="2293">2293</span>
+<span id="2294">2294</span>
+<span id="2295">2295</span>
+<span id="2296">2296</span>
+<span id="2297">2297</span>
+<span id="2298">2298</span>
+<span id="2299">2299</span>
+<span id="2300">2300</span>
+<span id="2301">2301</span>
+<span id="2302">2302</span>
+<span id="2303">2303</span>
+<span id="2304">2304</span>
+<span id="2305">2305</span>
+<span id="2306">2306</span>
+<span id="2307">2307</span>
+<span id="2308">2308</span>
+<span id="2309">2309</span>
+<span id="2310">2310</span>
+<span id="2311">2311</span>
+<span id="2312">2312</span>
+<span id="2313">2313</span>
+<span id="2314">2314</span>
+<span id="2315">2315</span>
+<span id="2316">2316</span>
+<span id="2317">2317</span>
+<span id="2318">2318</span>
+<span id="2319">2319</span>
+<span id="2320">2320</span>
+<span id="2321">2321</span>
+<span id="2322">2322</span>
+<span id="2323">2323</span>
+<span id="2324">2324</span>
+<span id="2325">2325</span>
+<span id="2326">2326</span>
+<span id="2327">2327</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
+<span class='comment'>// file at the top-level directory of this distribution and at</span>
+<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
+<span class='comment'>//</span>
+<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
+<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
+<span class='comment'>// except according to those terms.</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::{<span class='ident'>max</span>, <span class='ident'>min</span>};
+
+<span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>regex</span>::<span class='ident'>UNICODE_CLASSES</span>;
+
+<span class='kw'>use</span> {
+    <span class='ident'>Expr</span>, <span class='ident'>Repeater</span>, <span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>, <span class='ident'>CaptureIndex</span>, <span class='ident'>CaptureName</span>,
+    <span class='ident'>Error</span>, <span class='ident'>ErrorKind</span>, <span class='prelude-ty'>Result</span>,
+};
+
+<span class='doccomment'>/// Parser state.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Keeps the entire input in memory and maintains a cursor (char offset).</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// It also keeps an expression stack, which is responsible for managing</span>
+<span class='doccomment'>/// grouped expressions and flag state.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Parser</span> {
+    <span class='ident'>chars</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span>,
+    <span class='ident'>chari</span>: <span class='ident'>usize</span>,
+    <span class='ident'>stack</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span>,
+    <span class='ident'>caps</span>: <span class='ident'>usize</span>,
+    <span class='ident'>names</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>, <span class='comment'>// to check for duplicates</span>
+    <span class='ident'>flags</span>: <span class='ident'>Flags</span>,
+}
+
+<span class='doccomment'>/// An empheral type for representing the expression stack.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Everything on the stack is either a regular expression or a marker</span>
+<span class='doccomment'>/// indicating the opening of a group (possibly non-capturing). The opening</span>
+<span class='doccomment'>/// of a group copies the current flag state, which is reset on the parser</span>
+<span class='doccomment'>/// state once the group closes.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
+<span class='kw'>enum</span> <span class='ident'>Build</span> {
+    <span class='ident'>Expr</span>(<span class='ident'>Expr</span>),
+    <span class='ident'>LeftParen</span> {
+        <span class='ident'>i</span>: <span class='ident'>CaptureIndex</span>,
+        <span class='ident'>name</span>: <span class='ident'>CaptureName</span>,
+        <span class='ident'>chari</span>: <span class='ident'>usize</span>,
+        <span class='ident'>old_flags</span>: <span class='ident'>Flags</span>,
+    },
+}
+
+<span class='doccomment'>/// Flag state.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
+<span class='kw'>struct</span> <span class='ident'>Flags</span> {
+    <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+    <span class='ident'>multi</span>: <span class='ident'>bool</span>,
+    <span class='ident'>dotnl</span>: <span class='ident'>bool</span>,
+    <span class='ident'>swap_greed</span>: <span class='ident'>bool</span>,
+    <span class='ident'>ignore_space</span>: <span class='ident'>bool</span>,
+}
+
+<span class='comment'>// Primary expression parsing routines.</span>
+<span class='kw'>impl</span> <span class='ident'>Parser</span> {
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='ident'>Parser</span> {
+            <span class='ident'>chars</span>: <span class='ident'>s</span>.<span class='ident'>chars</span>().<span class='ident'>collect</span>(),
+            <span class='ident'>chari</span>: <span class='number'>0</span>,
+            <span class='ident'>stack</span>: <span class='macro'>vec</span><span class='macro'>!</span>[],
+            <span class='ident'>caps</span>: <span class='number'>0</span>,
+            <span class='ident'>names</span>: <span class='macro'>vec</span><span class='macro'>!</span>[],
+            <span class='ident'>flags</span>: <span class='ident'>Flags</span> {
+                <span class='ident'>casei</span>: <span class='boolval'>false</span>,
+                <span class='ident'>multi</span>: <span class='boolval'>false</span>,
+                <span class='ident'>dotnl</span>: <span class='boolval'>false</span>,
+                <span class='ident'>swap_greed</span>: <span class='boolval'>false</span>,
+                <span class='ident'>ignore_space</span>: <span class='boolval'>false</span>,
+            },
+        }.<span class='ident'>parse_expr</span>()
+    }
+
+    <span class='comment'>// Top-level expression parser.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Starts at the beginning of the input and consumes until either the end</span>
+    <span class='comment'>// of input or an error.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_expr</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='kw'>while</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='kw'>let</span> <span class='ident'>build_expr</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+                <span class='string'>&#39;\\&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_escape</span>()),
+                <span class='string'>&#39;|&#39;</span> <span class='op'>=&gt;</span> { <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>alternate</span>()); <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='ident'>e</span> }
+                <span class='string'>&#39;?&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_simple_repeat</span>(<span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>)),
+                <span class='string'>&#39;*&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_simple_repeat</span>(<span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>)),
+                <span class='string'>&#39;+&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_simple_repeat</span>(<span class='ident'>Repeater</span>::<span class='ident'>OneOrMore</span>)),
+                <span class='string'>&#39;{&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_counted_repeat</span>()),
+                <span class='string'>&#39;[&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>maybe_parse_ascii</span>() {
+                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class</span>()),
+                    <span class='prelude-val'>Some</span>(<span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>)),
+                },
+                <span class='string'>&#39;^&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>multi</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>StartLine</span>)
+                    } <span class='kw'>else</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>)
+                    }
+                }
+                <span class='string'>&#39;$&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>multi</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>EndLine</span>)
+                    } <span class='kw'>else</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>EndText</span>)
+                    }
+                }
+                <span class='string'>&#39;.&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>dotnl</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>AnyChar</span>)
+                    } <span class='kw'>else</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>AnyCharNoNL</span>)
+                    }
+                }
+                <span class='string'>&#39;(&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_group</span>()),
+                <span class='string'>&#39;)&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>let</span> (<span class='ident'>old_flags</span>, <span class='ident'>e</span>) <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>close_paren</span>());
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='self'>self</span>.<span class='ident'>flags</span> <span class='op'>=</span> <span class='ident'>old_flags</span>;
+                    <span class='ident'>e</span>
+                }
+                _ <span class='op'>=&gt;</span> <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+                    <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='self'>self</span>.<span class='ident'>bump</span>()],
+                    <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+                }),
+            };
+            <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>build_expr</span>.<span class='ident'>is_empty</span>() {
+                <span class='kw'>let</span> <span class='ident'>build_expr</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>maybe_class_case_fold</span>(<span class='ident'>build_expr</span>);
+                <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>push</span>(<span class='ident'>build_expr</span>);
+            }
+        }
+        <span class='self'>self</span>.<span class='ident'>finish_concat</span>()
+    }
+
+    <span class='comment'>// Parses an escape sequence, e.g., \Ax</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `\`</span>
+    <span class='comment'>// End:   `x`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_escape</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>));
+        }
+        <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cur</span>();
+        <span class='kw'>if</span> <span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+                <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='self'>self</span>.<span class='ident'>bump</span>()],
+                <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+            }));
+        }
+
+        <span class='kw'>fn</span> <span class='ident'>lit</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>Build</span> {
+            <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>], <span class='ident'>casei</span>: <span class='boolval'>false</span> })
+        }
+        <span class='kw'>match</span> <span class='ident'>c</span> {
+            <span class='string'>&#39;a&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\x07&#39;</span>)) }
+            <span class='string'>&#39;f&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\x0C&#39;</span>)) }
+            <span class='string'>&#39;t&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\t&#39;</span>)) }
+            <span class='string'>&#39;n&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\n&#39;</span>)) }
+            <span class='string'>&#39;r&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\r&#39;</span>)) }
+            <span class='string'>&#39;v&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\x0B&#39;</span>)) }
+            <span class='string'>&#39;A&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>)) }
+            <span class='string'>&#39;z&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>EndText</span>)) }
+            <span class='string'>&#39;b&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>WordBoundary</span>)) }
+            <span class='string'>&#39;B&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>NotWordBoundary</span>)) }
+            <span class='string'>&#39;0&#39;</span><span class='op'>|</span><span class='string'>&#39;1&#39;</span><span class='op'>|</span><span class='string'>&#39;2&#39;</span><span class='op'>|</span><span class='string'>&#39;3&#39;</span><span class='op'>|</span><span class='string'>&#39;4&#39;</span><span class='op'>|</span><span class='string'>&#39;5&#39;</span><span class='op'>|</span><span class='string'>&#39;6&#39;</span><span class='op'>|</span><span class='string'>&#39;7&#39;</span> <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>parse_octal</span>(),
+            <span class='string'>&#39;x&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='self'>self</span>.<span class='ident'>parse_hex</span>() }
+            <span class='string'>&#39;p&#39;</span><span class='op'>|</span><span class='string'>&#39;P&#39;</span> <span class='op'>=&gt;</span> {
+                <span class='self'>self</span>.<span class='ident'>bump</span>();
+                <span class='self'>self</span>.<span class='ident'>parse_unicode_class</span>(<span class='ident'>c</span> <span class='op'>==</span> <span class='string'>&#39;P&#39;</span>)
+                    .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>cls</span><span class='op'>|</span> <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>)))
+            }
+            <span class='string'>&#39;d&#39;</span><span class='op'>|</span><span class='string'>&#39;s&#39;</span><span class='op'>|</span><span class='string'>&#39;w&#39;</span><span class='op'>|</span><span class='string'>&#39;D&#39;</span><span class='op'>|</span><span class='string'>&#39;S&#39;</span><span class='op'>|</span><span class='string'>&#39;W&#39;</span> <span class='op'>=&gt;</span> {
+                <span class='self'>self</span>.<span class='ident'>bump</span>();
+                <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='self'>self</span>.<span class='ident'>parse_perl_class</span>(<span class='ident'>c</span>))))
+            }
+            <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedEscape</span>(<span class='ident'>c</span>))),
+        }
+    }
+
+    <span class='comment'>// Parses a group, e.g., `(abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `(`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// A more interesting example, `(?P&lt;foo&gt;abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `(`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_group</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>chari</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chari</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>name</span>: <span class='ident'>CaptureName</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&quot;?P&lt;&quot;</span>) {
+            <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_group_name</span>());
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>names</span>.<span class='ident'>iter</span>().<span class='ident'>any</span>(<span class='op'>|</span><span class='ident'>n2</span><span class='op'>|</span> <span class='ident'>n2</span> <span class='op'>==</span> <span class='kw-2'>&amp;</span><span class='ident'>n</span>) {
+                <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>DuplicateCaptureName</span>(<span class='ident'>n</span>)));
+            }
+            <span class='self'>self</span>.<span class='ident'>names</span>.<span class='ident'>push</span>(<span class='ident'>n</span>.<span class='ident'>clone</span>());
+            <span class='ident'>name</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>n</span>);
+        } <span class='kw'>else</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&quot;?&quot;</span>) {
+            <span class='comment'>// This can never be capturing. It&#39;s either setting flags for</span>
+            <span class='comment'>// the current group, or it&#39;s opening a non-capturing group or</span>
+            <span class='comment'>// it&#39;s opening a group with a specific set of flags (which is</span>
+            <span class='comment'>// also non-capturing).</span>
+            <span class='comment'>// Anything else is an error.</span>
+            <span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>parse_group_flags</span>(<span class='ident'>chari</span>);
+        }
+        <span class='self'>self</span>.<span class='ident'>caps</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>caps</span>, <span class='number'>1</span>);
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> {
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>caps</span>),
+            <span class='ident'>name</span>: <span class='ident'>name</span>,
+            <span class='ident'>chari</span>: <span class='ident'>chari</span>,
+            <span class='ident'>old_flags</span>: <span class='self'>self</span>.<span class='ident'>flags</span>, <span class='comment'>// no flags changed if we&#39;re here</span>
+        })
+    }
+
+    <span class='comment'>// Parses flags (inline or grouped), e.g., `(?s-i:abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `s`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Another example, `(?s-i)a`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `s`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_group_flags</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>opening_chari</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>old_flags</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>flags</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>sign</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+        <span class='kw'>loop</span> {
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+                <span class='comment'>// e.g., (?i</span>
+                <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedFlagEof</span>));
+            }
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+                <span class='string'>&#39;i&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;m&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>multi</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;s&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>dotnl</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;U&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>swap_greed</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;x&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>ignore_space</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;-&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>sign</span> {
+                        <span class='comment'>// e.g., (?-i-s)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>DoubleFlagNegation</span>));
+                    }
+                    <span class='ident'>sign</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+                    <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+                }
+                <span class='string'>&#39;)&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>saw_flag</span> {
+                        <span class='comment'>// e.g., (?)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>));
+                    }
+                    <span class='comment'>// At this point, we&#39;re just changing the flags inside</span>
+                    <span class='comment'>// the current group, which means the old flags have</span>
+                    <span class='comment'>// been saved elsewhere. Our modifications in place are</span>
+                    <span class='comment'>// okey dokey!</span>
+                    <span class='comment'>//</span>
+                    <span class='comment'>// This particular flag expression only has a stateful</span>
+                    <span class='comment'>// impact on a regex&#39;s AST, so nothing gets explicitly</span>
+                    <span class='comment'>// added.</span>
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Empty</span>));
+                }
+                <span class='string'>&#39;:&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>sign</span> <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='ident'>saw_flag</span> {
+                        <span class='comment'>// e.g., (?i-:a)</span>
+                        <span class='comment'>// Note that if there&#39;s no negation, it&#39;s OK not</span>
+                        <span class='comment'>// to see flag, because you end up with a regular</span>
+                        <span class='comment'>// non-capturing group: `(?:a)`.</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>));
+                    }
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> {
+                        <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                        <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+                        <span class='ident'>chari</span>: <span class='ident'>opening_chari</span>,
+                        <span class='ident'>old_flags</span>: <span class='ident'>old_flags</span>,
+                    });
+                }
+                <span class='comment'>// e.g., (?z:a)</span>
+                <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedFlag</span>(<span class='ident'>c</span>))),
+            }
+            <span class='self'>self</span>.<span class='ident'>bump</span>();
+        }
+    }
+
+    <span class='comment'>// Parses a group name, e.g., `foo` in `(?P&lt;foo&gt;abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `f`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_group_name</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>name</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>new</span>();
+        <span class='kw'>while</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>eof</span>() <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>peek_is</span>(<span class='string'>&#39;&gt;&#39;</span>) {
+            <span class='ident'>name</span>.<span class='ident'>push</span>(<span class='self'>self</span>.<span class='ident'>bump</span>());
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='comment'>// e.g., (?P&lt;a</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedCaptureName</span>(<span class='ident'>name</span>)));
+        }
+        <span class='kw'>let</span> <span class='ident'>all_valid</span> <span class='op'>=</span> <span class='ident'>name</span>.<span class='ident'>chars</span>().<span class='ident'>all</span>(<span class='ident'>is_valid_capture_char</span>);
+        <span class='kw'>match</span> <span class='ident'>name</span>.<span class='ident'>chars</span>().<span class='ident'>next</span>() {
+            <span class='comment'>// e.g., (?P&lt;&gt;a)</span>
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyCaptureName</span>)),
+            <span class='prelude-val'>Some</span>(<span class='ident'>c</span>) <span class='kw'>if</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;9&#39;</span>) <span class='op'>||</span> <span class='op'>!</span><span class='ident'>all_valid</span> <span class='op'>=&gt;</span> {
+                <span class='comment'>// e.g., (?P&lt;a#&gt;x)</span>
+                <span class='comment'>// e.g., (?P&lt;1a&gt;x)</span>
+                <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidCaptureName</span>(<span class='ident'>name</span>)))
+            }
+            _ <span class='op'>=&gt;</span> {
+                <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='comment'>// for `&gt;`</span>
+                <span class='prelude-val'>Ok</span>(<span class='ident'>name</span>)
+            }
+        }
+    }
+
+    <span class='comment'>// Parses a counted repeition operator, e.g., `a{2,4}?z`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `{`</span>
+    <span class='comment'>// End:   `z`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_counted_repeat</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>pop</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>)); <span class='comment'>// e.g., ({5}</span>
+        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+            <span class='comment'>// e.g., a*{5}</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>e</span>)));
+        }
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>let</span> <span class='ident'>min</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_decimal</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;,&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>));
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>max_opt</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>min</span>);
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;,&#39;</span>) {
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>peek_is</span>(<span class='string'>&#39;}&#39;</span>) {
+                <span class='ident'>max_opt</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
+            } <span class='kw'>else</span> {
+                <span class='kw'>let</span> <span class='ident'>max</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_decimal</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>));
+                <span class='kw'>if</span> <span class='ident'>min</span> <span class='op'>&gt;</span> <span class='ident'>max</span> {
+                    <span class='comment'>// e.g., a{2,1}</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidRepeatRange</span> {
+                        <span class='ident'>min</span>: <span class='ident'>min</span>,
+                        <span class='ident'>max</span>: <span class='ident'>max</span>,
+                    }));
+                }
+                <span class='ident'>max_opt</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>max</span>);
+            }
+        }
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;}&#39;</span>) {
+            <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedRepeat</span>))
+        } <span class='kw'>else</span> {
+            <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>min</span>, <span class='ident'>max</span>: <span class='ident'>max_opt</span> },
+                <span class='ident'>greedy</span>: <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;?&#39;</span>) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>swap_greed</span>,
+            }))
+        }
+    }
+
+    <span class='comment'>// Parses a simple repetition operator, e.g., `a+?z`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `+`</span>
+    <span class='comment'>// End:   `z`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// N.B. &quot;simple&quot; in this context means &quot;not min/max repetition&quot;,</span>
+    <span class='comment'>// e.g., `a{1,2}`.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_simple_repeat</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>rep</span>: <span class='ident'>Repeater</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>pop</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>)); <span class='comment'>// e.g., (*</span>
+        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+            <span class='comment'>// e.g., a**</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>e</span>)));
+        }
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>),
+            <span class='ident'>r</span>: <span class='ident'>rep</span>,
+            <span class='ident'>greedy</span>: <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;?&#39;</span>) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>swap_greed</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a decimal number until the given character, e.g., `a{123,456}`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `1`</span>
+    <span class='comment'>// End:   `,` (where `until == &#39;,&#39;`)</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_decimal</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>until</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> {
+        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='ident'>until</span>) {
+            <span class='comment'>// e.g., a{}</span>
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>MissingBase10</span>)),
+            <span class='prelude-val'>Some</span>(<span class='ident'>n</span>) <span class='op'>=&gt;</span> {
+                <span class='comment'>// e.g., a{xyz</span>
+                <span class='comment'>// e.g., a{9999999999}</span>
+                <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>n</span>.<span class='ident'>trim</span>();
+                <span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='ident'>n</span>, <span class='number'>10</span>)
+                    .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='ident'>n</span>.<span class='ident'>into</span>())))
+            }
+        }
+    }
+
+    <span class='comment'>// Parses an octal number, up to 3 digits, e.g., `a\123b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `1`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_octal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>; <span class='comment'>// counter for limiting octal to 3 digits.</span>
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> { <span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>; <span class='ident'>i</span> <span class='op'>&lt;=</span> <span class='number'>3</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;7&#39;</span> })
+                    .<span class='ident'>expect</span>(<span class='string'>&quot;octal string&quot;</span>); <span class='comment'>// guaranteed at least 1 digit</span>
+        <span class='comment'>// I think both of the following unwraps are impossible to fail.</span>
+        <span class='comment'>// We limit it to a three digit octal number, which maxes out at</span>
+        <span class='comment'>// `0777` or `511` in decimal. Since all digits are in `0...7`, we&#39;ll</span>
+        <span class='comment'>// always have a valid `u32` number. Moreover, since all numbers in</span>
+        <span class='comment'>// the range `0...511` are valid Unicode scalar values, it will always</span>
+        <span class='comment'>// be a valid `char`.</span>
+        <span class='comment'>//</span>
+        <span class='comment'>// Hence, we `unwrap` with reckless abandon.</span>
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='kw-2'>&amp;</span><span class='ident'>n</span>, <span class='number'>8</span>).<span class='ident'>ok</span>().<span class='ident'>expect</span>(<span class='string'>&quot;valid octal number&quot;</span>);
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+            <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>n</span>).<span class='ident'>expect</span>(<span class='string'>&quot;Unicode scalar value&quot;</span>)],
+            <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a hex number, e.g., `a\x5ab`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `5`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// And also, `a\x{2603}b`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `{`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_hex</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;{&#39;</span>) {
+            <span class='self'>self</span>.<span class='ident'>parse_hex_many_digits</span>()
+        } <span class='kw'>else</span> {
+            <span class='self'>self</span>.<span class='ident'>parse_hex_two_digits</span>()
+        }
+    }
+
+    <span class='comment'>// Parses a many-digit hex number, e.g., `a\x{2603}b`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `2`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_hex_many_digits</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+
+        <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>());
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='kw-2'>&amp;</span><span class='ident'>s</span>, <span class='number'>16</span>)
+                         .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='ident'>s</span>))));
+        <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>n</span>)
+                          .<span class='ident'>ok_or</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidScalarValue</span>(<span class='ident'>n</span>))));
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;}&#39;</span>) {
+            <span class='comment'>// e.g., a\x{d</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedHex</span>));
+        }
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+            <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>],
+            <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a two-digit hex number, e.g., `a\x5ab`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `5`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_hex_two_digits</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>;
+        <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span>_<span class='op'>|</span> { <span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>; <span class='ident'>i</span> <span class='op'>&lt;=</span> <span class='number'>2</span> }).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>());
+        <span class='kw'>if</span> <span class='ident'>s</span>.<span class='ident'>len</span>() <span class='op'>&lt;</span> <span class='number'>2</span> {
+            <span class='comment'>// e.g., a\x</span>
+            <span class='comment'>// e.g., a\xf</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedTwoDigitHexEof</span>));
+        }
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='kw-2'>&amp;</span><span class='ident'>s</span>, <span class='number'>16</span>)
+                         .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='ident'>s</span>))));
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+            <span class='comment'>// Because 0...255 are all valid Unicode scalar values.</span>
+            <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>n</span>).<span class='ident'>expect</span>(<span class='string'>&quot;Unicode scalar value&quot;</span>)],
+            <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a character class, e.g., `[^a-zA-Z0-9]+`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `[`</span>
+    <span class='comment'>// End:   `+`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_class</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>let</span> <span class='ident'>negated</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;^&#39;</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>class</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>();
+        <span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;-&#39;</span>) {
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='string'>&#39;-&#39;</span>));
+        }
+        <span class='kw'>loop</span> {
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+                <span class='comment'>// e.g., [a</span>
+                <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>));
+            }
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+                <span class='comment'>// If no ranges have been added, then `]` is the first</span>
+                <span class='comment'>// character (sans, perhaps, the `^` symbol), so it should</span>
+                <span class='comment'>// be interpreted as a `]` instead of a closing class bracket.</span>
+                <span class='string'>&#39;]&#39;</span> <span class='kw'>if</span> <span class='ident'>class</span>.<span class='ident'>len</span>() <span class='op'>&gt;</span> <span class='number'>0</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='kw'>break</span> }
+                <span class='string'>&#39;[&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>maybe_parse_ascii</span>() {
+                    <span class='prelude-val'>Some</span>(<span class='ident'>class2</span>) <span class='op'>=&gt;</span> <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>class2</span>),
+                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
+                        <span class='self'>self</span>.<span class='ident'>bump</span>();
+                        <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>class</span>, <span class='string'>&#39;[&#39;</span>))
+                    }
+                },
+                <span class='string'>&#39;\\&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_escape</span>()) {
+                    <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class2</span>)) <span class='op'>=&gt;</span> {
+                        <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>class2</span>);
+                    }
+                    <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>, .. }) <span class='op'>=&gt;</span> {
+                        <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>class</span>, <span class='ident'>chars</span>[<span class='number'>0</span>]));
+                    }
+                    <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>) <span class='op'>=&gt;</span> {
+                        <span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>e</span>);
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>err</span>));
+                    }
+                    <span class='comment'>// Because `parse_escape` can never return `LeftParen`.</span>
+                    _ <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+                },
+                <span class='ident'>start</span> <span class='op'>=&gt;</span> {
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>class</span>, <span class='ident'>start</span>));
+                }
+            }
+        }
+        <span class='kw'>if</span> <span class='ident'>negated</span> {
+            <span class='ident'>class</span> <span class='op'>=</span> <span class='ident'>class</span>.<span class='ident'>negate</span>();
+        }
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>.<span class='ident'>canonicalize</span>())))
+    }
+
+    <span class='comment'>// Parses a single range in a character class.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Since this is a helper for `parse_class`, its signature sticks out.</span>
+    <span class='comment'>// Namely, it requires the start character of the range and the char</span>
+    <span class='comment'>// class to mutate.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// e.g., `[a-z]`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `-` (with start == `a`)</span>
+    <span class='comment'>// End:   `]`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>class</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>CharClass</span>, <span class='ident'>start</span>: <span class='ident'>char</span>)
+                        <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;-&#39;</span>) {
+            <span class='comment'>// Not a range, so just push a singleton range.</span>
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='ident'>start</span>));
+            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(());
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='comment'>// e.g., [a-</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>));
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>peek_is</span>(<span class='string'>&#39;]&#39;</span>) {
+            <span class='comment'>// This is the end of the class, so we permit use of `-` as a</span>
+            <span class='comment'>// regular char (just like we do in the beginning).</span>
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='ident'>start</span>));
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='string'>&#39;-&#39;</span>));
+            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(());
+        }
+
+        <span class='comment'>// We have a real range. Just need to check to parse literal and</span>
+        <span class='comment'>// make sure it&#39;s a valid range.</span>
+        <span class='kw'>let</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+            <span class='string'>&#39;\\&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_escape</span>()) {
+                <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>, .. }) <span class='op'>=&gt;</span> <span class='ident'>chars</span>[<span class='number'>0</span>],
+                <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>) <span class='op'>=&gt;</span> {
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>e</span>)));
+                }
+                <span class='comment'>// Because `parse_escape` can never return `LeftParen`.</span>
+                _ <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+            },
+            _ <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>bump</span>(),
+        };
+        <span class='kw'>if</span> <span class='ident'>end</span> <span class='op'>&lt;</span> <span class='ident'>start</span> {
+            <span class='comment'>// e.g., [z-a]</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassRange</span> {
+                <span class='ident'>start</span>: <span class='ident'>start</span>,
+                <span class='ident'>end</span>: <span class='ident'>end</span>,
+            }));
+        }
+        <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+        <span class='prelude-val'>Ok</span>(())
+    }
+
+    <span class='comment'>// Parses an ASCII class, e.g., `[:alnum:]+`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `[`</span>
+    <span class='comment'>// End:   `+`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Also supports negation, e.g., `[:^alnum:]`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This parsing routine is distinct from the others in that it doesn&#39;t</span>
+    <span class='comment'>// actually report any errors. Namely, if it fails, then the parser should</span>
+    <span class='comment'>// fall back to parsing a regular class.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This method will only make progress in the parser if it succeeds.</span>
+    <span class='comment'>// Otherwise, the input remains where it started.</span>
+    <span class='kw'>fn</span> <span class='ident'>maybe_parse_ascii</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+        <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+            <span class='ident'>p</span>.<span class='ident'>bump</span>(); <span class='comment'>// the `[`</span>
+            <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>p</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;:&#39;</span>) { <span class='kw'>return</span> <span class='prelude-val'>None</span>; }
+            <span class='kw'>let</span> <span class='ident'>negate</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;^&#39;</span>);
+            <span class='kw'>let</span> <span class='ident'>name</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>p</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;:&#39;</span>) {
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
+                <span class='prelude-val'>Some</span>(<span class='ident'>name</span>) <span class='op'>=&gt;</span> <span class='ident'>name</span>,
+            };
+            <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>p</span>.<span class='ident'>bump_if</span>(<span class='string'>&quot;:]&quot;</span>) { <span class='kw'>return</span> <span class='prelude-val'>None</span>; }
+            <span class='ident'>ascii_class</span>(<span class='kw-2'>&amp;</span><span class='ident'>name</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>negate</span> { <span class='ident'>c</span> } <span class='kw'>else</span> { <span class='ident'>c</span>.<span class='ident'>negate</span>() })
+        }
+        <span class='kw'>let</span> <span class='ident'>start</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chari</span>;
+        <span class='kw'>match</span> <span class='ident'>parse</span>(<span class='self'>self</span>) {
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>start</span>; <span class='prelude-val'>None</span> }
+            <span class='ident'>result</span> <span class='op'>=&gt;</span> <span class='ident'>result</span>,
+        }
+    }
+
+    <span class='comment'>// Parses a Uncode class name, e.g., `a\pLb`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `L`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// And also, `a\p{Greek}b`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `{`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// `negate` is true when the class name is used with `\P`.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_unicode_class</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>neg</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>name</span> <span class='op'>=</span>
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;{&#39;</span>) {
+                <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>());
+                <span class='kw'>if</span> <span class='ident'>n</span>.<span class='ident'>is_empty</span>() <span class='op'>||</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;}&#39;</span>) {
+                    <span class='comment'>// e.g., \p{Greek</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedUnicodeName</span>));
+                }
+                <span class='ident'>n</span>
+            } <span class='kw'>else</span> {
+                <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+                    <span class='comment'>// e.g., \p</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>));
+                }
+                <span class='self'>self</span>.<span class='ident'>bump</span>().<span class='ident'>to_string</span>()
+            };
+        <span class='kw'>match</span> <span class='ident'>unicode_class</span>(<span class='kw-2'>&amp;</span><span class='ident'>name</span>) {
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='ident'>name</span>))),
+            <span class='prelude-val'>Some</span>(<span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='kw'>if</span> <span class='ident'>neg</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>()) } <span class='kw'>else</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>cls</span>) },
+        }
+    }
+
+    <span class='comment'>// Parses a perl character class with Unicode support.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// `name` must be one of d, s, w, D, S, W. If not, this function panics.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// No parser state is changed.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_perl_class</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>name</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>regex</span>::{<span class='ident'>PERLD</span>, <span class='ident'>PERLS</span>, <span class='ident'>PERLW</span>};
+        <span class='kw'>match</span> <span class='ident'>name</span> {
+            <span class='string'>&#39;d&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLD</span>),
+            <span class='string'>&#39;D&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>(),
+            <span class='string'>&#39;s&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLS</span>),
+            <span class='string'>&#39;S&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>(),
+            <span class='string'>&#39;w&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLW</span>),
+            <span class='string'>&#39;W&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>(),
+            _ <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+        }
+    }
+
+    <span class='comment'>// Always bump to the next input and return the given expression as a</span>
+    <span class='comment'>// `Build`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This is mostly for convenience when the surrounding context implies</span>
+    <span class='comment'>// that the next character corresponds to the given expression.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_one</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>e</span>: <span class='ident'>Expr</span>) <span class='op'>-&gt;</span> <span class='ident'>Build</span> {
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)
+    }
+}
+
+<span class='comment'>// Auxiliary helper methods.</span>
+<span class='kw'>impl</span> <span class='ident'>Parser</span> {
+    <span class='kw'>fn</span> <span class='ident'>chars</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Chars</span> {
+        <span class='ident'>Chars</span>::<span class='ident'>new</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>chari</span>..], <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>ignore_space</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>bump</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+        <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cur</span>();
+        <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='self'>self</span>.<span class='ident'>chars</span>().<span class='ident'>next_count</span>());
+        <span class='ident'>c</span>
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>cur</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> { <span class='self'>self</span>.<span class='ident'>chars</span>().<span class='ident'>next</span>().<span class='ident'>unwrap</span>() }
+
+    <span class='kw'>fn</span> <span class='ident'>eof</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='self'>self</span>.<span class='ident'>chars</span>().<span class='ident'>next</span>().<span class='ident'>is_none</span>() }
+
+    <span class='kw'>fn</span> <span class='ident'>bump_get</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>match_end</span>(<span class='self'>self</span>);
+        <span class='kw'>if</span> <span class='ident'>n</span> <span class='op'>==</span> <span class='number'>0</span> {
+            <span class='prelude-val'>None</span>
+        } <span class='kw'>else</span> {
+            <span class='kw'>let</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='ident'>n</span>);
+            <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>chari</span>..<span class='ident'>end</span>]
+                        .<span class='ident'>iter</span>().<span class='ident'>cloned</span>().<span class='ident'>collect</span>::<span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>();
+            <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>end</span>;
+            <span class='prelude-val'>Some</span>(<span class='ident'>s</span>)
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>bump_if</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>match_end</span>(<span class='self'>self</span>);
+        <span class='kw'>if</span> <span class='ident'>n</span> <span class='op'>==</span> <span class='number'>0</span> {
+            <span class='boolval'>false</span>
+        } <span class='kw'>else</span> {
+            <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='ident'>n</span>);
+            <span class='boolval'>true</span>
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>peek_is</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>s</span>.<span class='ident'>match_end</span>(<span class='self'>self</span>) <span class='op'>&gt;</span> <span class='number'>0</span>
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>err</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>) <span class='op'>-&gt;</span> <span class='ident'>Error</span> {
+        <span class='self'>self</span>.<span class='ident'>errat</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='ident'>kind</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>errat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>pos</span>: <span class='ident'>usize</span>, <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>) <span class='op'>-&gt;</span> <span class='ident'>Error</span> {
+        <span class='ident'>Error</span> { <span class='ident'>pos</span>: <span class='ident'>pos</span>, <span class='ident'>surround</span>: <span class='self'>self</span>.<span class='ident'>windowat</span>(<span class='ident'>pos</span>), <span class='ident'>kind</span>: <span class='ident'>kind</span> }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>windowat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>pos</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+        <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='ident'>max</span>(<span class='number'>5</span>, <span class='ident'>pos</span>) <span class='op'>-</span> <span class='number'>5</span>;
+        <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>(), <span class='ident'>checkadd</span>(<span class='ident'>pos</span>, <span class='number'>5</span>));
+        <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='ident'>s</span>..<span class='ident'>e</span>].<span class='ident'>iter</span>().<span class='ident'>cloned</span>().<span class='ident'>collect</span>()
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>pop</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>expected</span>: <span class='ident'>ErrorKind</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+            <span class='prelude-val'>None</span> <span class='op'>|</span> <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span>{..}) <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>expected</span>)),
+            <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>e</span>),
+        }
+    }
+
+    <span class='comment'>// If the current contexts calls for case insensitivity and if the expr</span>
+    <span class='comment'>// given is a character class, do case folding on it and return the new</span>
+    <span class='comment'>// class.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Otherwise, return the expression unchanged.</span>
+    <span class='kw'>fn</span> <span class='ident'>maybe_class_case_fold</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>bexpr</span>: <span class='ident'>Build</span>) <span class='op'>-&gt;</span> <span class='ident'>Build</span> {
+        <span class='kw'>match</span> <span class='ident'>bexpr</span> {
+            <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>)) <span class='op'>=&gt;</span> {
+                <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span> <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='ident'>cls</span>.<span class='ident'>casei</span> {
+                        <span class='ident'>cls</span>.<span class='ident'>case_fold</span>()
+                    } <span class='kw'>else</span> {
+                        <span class='ident'>cls</span>
+                    }
+                ))
+            }
+            <span class='ident'>bexpr</span> <span class='op'>=&gt;</span> <span class='ident'>bexpr</span>,
+        }
+    }
+}
+
+<span class='kw'>struct</span> <span class='ident'>Chars</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='ident'>chars</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> [<span class='ident'>char</span>],
+    <span class='ident'>cur</span>: <span class='ident'>usize</span>,
+    <span class='ident'>ignore_space</span>: <span class='ident'>bool</span>,
+    <span class='ident'>in_comment</span>: <span class='ident'>bool</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>Chars</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>char</span>;
+    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>skip</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>() {
+            <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>cur</span>];
+            <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>cur</span>, <span class='number'>1</span>);
+            <span class='prelude-val'>Some</span>(<span class='ident'>c</span>)
+        } <span class='kw'>else</span> {
+            <span class='prelude-val'>None</span>
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Chars</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>chars</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>char</span>], <span class='ident'>ignore_space</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='ident'>Chars</span> {
+        <span class='ident'>Chars</span> {
+            <span class='ident'>chars</span>: <span class='ident'>chars</span>,
+            <span class='ident'>cur</span>: <span class='number'>0</span>,
+            <span class='ident'>ignore_space</span>: <span class='ident'>ignore_space</span>,
+            <span class='ident'>in_comment</span>: <span class='boolval'>false</span>,
+        }
+    }
+
+    <span class='doccomment'>/// Skip line comments and whitespace</span>
+    <span class='kw'>fn</span> <span class='ident'>skip</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>ignore_space</span> { <span class='kw'>return</span>; }
+        <span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>() {
+            <span class='comment'>// Handle escaping of `#`, i.e. don&#39;t start a comment with `\#`.</span>
+            <span class='kw'>let</span> <span class='ident'>next_cur</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>cur</span>, <span class='number'>1</span>);
+            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>c</span>() <span class='op'>==</span> <span class='string'>&#39;\\&#39;</span>
+                <span class='op'>&amp;&amp;</span> <span class='ident'>next_cur</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>()
+                <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='ident'>next_cur</span>] <span class='op'>==</span> <span class='string'>&#39;#&#39;</span>
+            {
+                <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>=</span> <span class='ident'>next_cur</span>;
+                <span class='kw'>break</span>;
+            }
+
+            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>c</span>() <span class='op'>==</span> <span class='string'>&#39;#&#39;</span> {
+                <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>c</span>() <span class='op'>==</span> <span class='string'>&#39;\n&#39;</span> {
+                <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+            }
+
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>c</span>().<span class='ident'>is_whitespace</span>() {
+                <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>=</span> <span class='ident'>next_cur</span>;
+            } <span class='kw'>else</span> {
+                <span class='kw'>break</span>;
+            }
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>c</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+        <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>cur</span>]
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>next_count</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='self'>self</span>.<span class='ident'>next</span>();
+        <span class='self'>self</span>.<span class='ident'>cur</span>
+    }
+}
+
+<span class='comment'>// Auxiliary methods for manipulating the expression stack.</span>
+<span class='kw'>impl</span> <span class='ident'>Parser</span> {
+    <span class='comment'>// Called whenever an alternate (`|`) is found.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This pops the expression stack until:</span>
+    <span class='comment'>//</span>
+    <span class='comment'>//  1. The stack is empty. Pushes an alternation with one arm.</span>
+    <span class='comment'>//  2. An opening parenthesis is found. Leave the parenthesis</span>
+    <span class='comment'>//     on the stack and push an alternation with one arm.</span>
+    <span class='comment'>//  3. An alternate (`|`) is found. Pop the existing alternation,</span>
+    <span class='comment'>//     add an arm and push the modified alternation.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Each &quot;arm&quot; in the above corresponds to the concatenation of all</span>
+    <span class='comment'>// popped expressions.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// In the first two cases, the stack is left in an invalid state</span>
+    <span class='comment'>// because an alternation with one arm is not allowed. This</span>
+    <span class='comment'>// particular state will be detected by `finish_concat` and an</span>
+    <span class='comment'>// error will be reported.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// In none of the cases is an empty arm allowed. If an empty arm</span>
+    <span class='comment'>// is found, an error is reported.</span>
+    <span class='kw'>fn</span> <span class='ident'>alternate</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>concat</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='kw'>let</span> <span class='ident'>alts</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>es</span><span class='op'>|</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='ident'>es</span>)));
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., |a</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='kw'>return</span> <span class='ident'>alts</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)]);
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>e</span> <span class='kw-2'>@</span> <span class='ident'>Build</span>::<span class='ident'>LeftParen</span>{..}) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., (|a)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>push</span>(<span class='ident'>e</span>);
+                    <span class='kw'>return</span> <span class='ident'>alts</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)]);
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='kw-2'>mut</span> <span class='ident'>es</span>))) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., a||</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>));
+                    <span class='kw'>return</span> <span class='ident'>alts</span>(<span class='ident'>es</span>);
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> { <span class='ident'>concat</span>.<span class='ident'>push</span>(<span class='ident'>e</span>); }
+            }
+        }
+    }
+
+    <span class='comment'>// Called whenever a closing parenthesis (`)`) is found.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This pops the expression stack until:</span>
+    <span class='comment'>//</span>
+    <span class='comment'>//  1. The stack is empty. An error is reported because this</span>
+    <span class='comment'>//     indicates an unopened parenthesis.</span>
+    <span class='comment'>//  2. An opening parenthesis is found. Pop the opening parenthesis</span>
+    <span class='comment'>//     and push a `Group` expression.</span>
+    <span class='comment'>//  3. An alternate (`|`) is found. Pop the existing alternation</span>
+    <span class='comment'>//     and an arm to it in place. Pop one more item from the stack.</span>
+    <span class='comment'>//     If the stack was empty, then report an unopened parenthesis</span>
+    <span class='comment'>//     error, otherwise assume it is an opening parenthesis and</span>
+    <span class='comment'>//     push a `Group` expression with the popped alternation.</span>
+    <span class='comment'>//     (We can assume this is an opening parenthesis because an</span>
+    <span class='comment'>//     alternation either corresponds to the entire Regex or it</span>
+    <span class='comment'>//     corresponds to an entire group. This is guaranteed by the</span>
+    <span class='comment'>//     `alternate` method.)</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Each &quot;arm&quot; in the above corresponds to the concatenation of all</span>
+    <span class='comment'>// popped expressions.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Empty arms nor empty groups are allowed.</span>
+    <span class='kw'>fn</span> <span class='ident'>close_paren</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(<span class='ident'>Flags</span>, <span class='ident'>Build</span>)<span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>concat</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                <span class='comment'>// e.g., )</span>
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>)),
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> { <span class='ident'>i</span>, <span class='ident'>name</span>, <span class='ident'>old_flags</span>, .. }) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., ()</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyGroup</span>));
+                    }
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>((<span class='ident'>old_flags</span>, <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                        <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)),
+                        <span class='ident'>i</span>: <span class='ident'>i</span>,
+                        <span class='ident'>name</span>: <span class='ident'>name</span>,
+                    })));
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='kw-2'>mut</span> <span class='ident'>es</span>))) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., (a|)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>));
+                    <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                        <span class='comment'>// e.g., a|b)</span>
+                        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>)),
+                        <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(_)) <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+                        <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> { <span class='ident'>i</span>, <span class='ident'>name</span>, <span class='ident'>old_flags</span>, .. }) <span class='op'>=&gt;</span> {
+                            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>((<span class='ident'>old_flags</span>, <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='ident'>es</span>)),
+                                <span class='ident'>i</span>: <span class='ident'>i</span>,
+                                <span class='ident'>name</span>: <span class='ident'>name</span>,
+                            })));
+                        }
+                    }
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> { <span class='ident'>concat</span>.<span class='ident'>push</span>(<span class='ident'>e</span>); }
+            }
+        }
+    }
+
+    <span class='comment'>// Called only when the parser reaches the end of input.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This pops the expression stack until:</span>
+    <span class='comment'>//</span>
+    <span class='comment'>//  1. The stack is empty. Return concatenation of popped</span>
+    <span class='comment'>//     expressions. This concatenation may be empty!</span>
+    <span class='comment'>//  2. An alternation is found. Pop the alternation and push</span>
+    <span class='comment'>//     a new arm. Return the alternation as the entire Regex.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// If an opening parenthesis is popped, then an error is</span>
+    <span class='comment'>// returned since it indicates an unclosed parenthesis.</span>
+    <span class='kw'>fn</span> <span class='ident'>finish_concat</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>concat</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> { <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)); }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span>{ <span class='ident'>chari</span>, ..}) <span class='op'>=&gt;</span> {
+                    <span class='comment'>// e.g., a(b</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>errat</span>(<span class='ident'>chari</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedParen</span>));
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='kw-2'>mut</span> <span class='ident'>es</span>))) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., a|</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>));
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='ident'>es</span>));
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> { <span class='ident'>concat</span>.<span class='ident'>push</span>(<span class='ident'>e</span>); }
+            }
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Build</span> {
+    <span class='kw'>fn</span> <span class='ident'>is_empty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Empty</span>) <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+            _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+        }
+    }
+}
+
+<span class='comment'>// Make it ergonomic to conditionally bump the parser.</span>
+<span class='comment'>// i.e., `bump_if(&#39;a&#39;)` or `bump_if(&quot;abc&quot;)`.</span>
+<span class='kw'>trait</span> <span class='ident'>Bumpable</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span>;
+}
+
+<span class='kw'>impl</span> <span class='ident'>Bumpable</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>chars</span>();
+        <span class='kw'>if</span> <span class='ident'>chars</span>.<span class='ident'>next</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='self'>self</span>).<span class='ident'>unwrap_or</span>(<span class='boolval'>false</span>) {
+            <span class='ident'>chars</span>.<span class='ident'>cur</span>
+        } <span class='kw'>else</span> {
+            <span class='number'>0</span>
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Bumpable</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>search</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rest</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>chars</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='number'>0</span>;
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> (<span class='ident'>rest</span>.<span class='ident'>next</span>(), <span class='ident'>search</span>.<span class='ident'>next</span>()) {
+                (<span class='prelude-val'>Some</span>(<span class='ident'>c1</span>), <span class='prelude-val'>Some</span>(<span class='ident'>c2</span>)) <span class='kw'>if</span> <span class='ident'>c1</span> <span class='op'>==</span> <span class='ident'>c2</span> <span class='op'>=&gt;</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>rest</span>.<span class='ident'>cur</span>,
+                (_, <span class='prelude-val'>None</span>) <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='ident'>count</span>,
+                _ <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='number'>0</span>,
+            }
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>FnMut</span>(<span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span><span class='op'>&gt;</span> <span class='ident'>Bumpable</span> <span class='kw'>for</span> <span class='ident'>F</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>chars</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='number'>0</span>;
+        <span class='kw'>while</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>c</span>) <span class='op'>=</span> <span class='ident'>chars</span>.<span class='ident'>next</span>() {
+            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>(<span class='ident'>c</span>) {
+                <span class='kw'>break</span>
+            }
+            <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>chars</span>.<span class='ident'>cur</span>;
+        }
+        <span class='ident'>count</span>
+    }
+}
+
+<span class='comment'>// Turn a sequence of expressions into a concatenation.</span>
+<span class='comment'>// This only uses `Concat` if there are 2 or more expressions.</span>
+<span class='kw'>fn</span> <span class='ident'>rev_concat</span>(<span class='kw-2'>mut</span> <span class='ident'>exprs</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> {
+    <span class='kw'>if</span> <span class='ident'>exprs</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>0</span> {
+        <span class='ident'>Expr</span>::<span class='ident'>Empty</span>
+    } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>exprs</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span> {
+        <span class='ident'>exprs</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>()
+    } <span class='kw'>else</span> {
+        <span class='ident'>exprs</span>.<span class='ident'>reverse</span>();
+        <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='ident'>exprs</span>)
+    }
+}
+
+<span class='comment'>// Returns true if and only if the given character is allowed in a capture</span>
+<span class='comment'>// name. Note that the first char of a capture name must not be numeric.</span>
+<span class='kw'>fn</span> <span class='ident'>is_valid_capture_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>&#39;_&#39;</span> <span class='op'>||</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;9&#39;</span>)
+    <span class='op'>||</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;a&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;z&#39;</span>) <span class='op'>||</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;A&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;Z&#39;</span>)
+}
+
+<span class='doccomment'>/// Returns true if the give character has significance in a regex.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_punct</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='string'>&#39;\\&#39;</span> <span class='op'>|</span> <span class='string'>&#39;.&#39;</span> <span class='op'>|</span> <span class='string'>&#39;+&#39;</span> <span class='op'>|</span> <span class='string'>&#39;*&#39;</span> <span class='op'>|</span> <span class='string'>&#39;?&#39;</span> <span class='op'>|</span> <span class='string'>&#39;(&#39;</span> <span class='op'>|</span> <span class='string'>&#39;)&#39;</span> <span class='op'>|</span> <span class='string'>&#39;|&#39;</span> <span class='op'>|</span>
+        <span class='string'>&#39;[&#39;</span> <span class='op'>|</span> <span class='string'>&#39;]&#39;</span> <span class='op'>|</span> <span class='string'>&#39;{&#39;</span> <span class='op'>|</span> <span class='string'>&#39;}&#39;</span> <span class='op'>|</span> <span class='string'>&#39;^&#39;</span> <span class='op'>|</span> <span class='string'>&#39;$&#39;</span> <span class='op'>|</span> <span class='string'>&#39;#&#39;</span> <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+        _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+    }
+}
+
+<span class='kw'>fn</span> <span class='ident'>checkadd</span>(<span class='ident'>x</span>: <span class='ident'>usize</span>, <span class='ident'>y</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+    <span class='ident'>x</span>.<span class='ident'>checked_add</span>(<span class='ident'>y</span>).<span class='ident'>expect</span>(<span class='string'>&quot;regex length overflow&quot;</span>)
+}
+
+<span class='kw'>fn</span> <span class='ident'>unicode_class</span>(<span class='ident'>name</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+    <span class='ident'>UNICODE_CLASSES</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, _)<span class='op'>|</span> <span class='ident'>s</span>.<span class='ident'>cmp</span>(<span class='ident'>name</span>)).<span class='ident'>ok</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> {
+        <span class='ident'>raw_class_to_expr</span>(<span class='ident'>UNICODE_CLASSES</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+    })
+}
+
+<span class='kw'>fn</span> <span class='ident'>ascii_class</span>(<span class='ident'>name</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+    <span class='ident'>ASCII_CLASSES</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, _)<span class='op'>|</span> <span class='ident'>s</span>.<span class='ident'>cmp</span>(<span class='ident'>name</span>)).<span class='ident'>ok</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> {
+        <span class='ident'>raw_class_to_expr</span>(<span class='ident'>ASCII_CLASSES</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+    })
+}
+
+<span class='kw'>fn</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>raw</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>let</span> <span class='ident'>range</span> <span class='op'>=</span> <span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, <span class='ident'>e</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>s</span>, <span class='ident'>end</span>: <span class='ident'>e</span> };
+    <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>raw</span>.<span class='ident'>iter</span>().<span class='ident'>map</span>(<span class='ident'>range</span>).<span class='ident'>collect</span>())
+}
+
+<span class='kw'>type</span> <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [(<span class='ident'>char</span>, <span class='ident'>char</span>)];
+<span class='kw'>type</span> <span class='ident'>NamedClasses</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span>, <span class='ident'>Class</span>)];
+
+<span class='kw'>const</span> <span class='ident'>ASCII_CLASSES</span>: <span class='ident'>NamedClasses</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[
+    <span class='comment'>// Classes must be in alphabetical order so that bsearch works.</span>
+    <span class='comment'>// [:alnum:]      alphanumeric (== [0-9A-Za-z])</span>
+    <span class='comment'>// [:alpha:]      alphabetic (== [A-Za-z])</span>
+    <span class='comment'>// [:ascii:]      ASCII (== [\x00-\x7F])</span>
+    <span class='comment'>// [:blank:]      blank (== [\t ])</span>
+    <span class='comment'>// [:cntrl:]      control (== [\x00-\x1F\x7F])</span>
+    <span class='comment'>// [:digit:]      digits (== [0-9])</span>
+    <span class='comment'>// [:graph:]      graphical (== [!-~])</span>
+    <span class='comment'>// [:lower:]      lower case (== [a-z])</span>
+    <span class='comment'>// [:print:]      printable (== [ -~] == [ [:graph:]])</span>
+    <span class='comment'>// [:punct:]      punctuation (== [!-/:-@[-`{-~])</span>
+    <span class='comment'>// [:space:]      whitespace (== [\t\n\v\f\r ])</span>
+    <span class='comment'>// [:upper:]      upper case (== [A-Z])</span>
+    <span class='comment'>// [:word:]       word characters (== [0-9A-Za-z_])</span>
+    <span class='comment'>// [:xdigit:]     hex digit (== [0-9A-Fa-f])</span>
+    <span class='comment'>// Taken from: http://golang.org/pkg/regex/syntax/</span>
+    (<span class='string'>&quot;alnum&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>ALNUM</span>),
+    (<span class='string'>&quot;alpha&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>ALPHA</span>),
+    (<span class='string'>&quot;ascii&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>ASCII</span>),
+    (<span class='string'>&quot;blank&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>BLANK</span>),
+    (<span class='string'>&quot;cntrl&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>CNTRL</span>),
+    (<span class='string'>&quot;digit&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>DIGIT</span>),
+    (<span class='string'>&quot;graph&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>GRAPH</span>),
+    (<span class='string'>&quot;lower&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>LOWER</span>),
+    (<span class='string'>&quot;print&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>PRINT</span>),
+    (<span class='string'>&quot;punct&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>PUNCT</span>),
+    (<span class='string'>&quot;space&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>SPACE</span>),
+    (<span class='string'>&quot;upper&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>UPPER</span>),
+    (<span class='string'>&quot;word&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>WORD</span>),
+    (<span class='string'>&quot;xdigit&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>XDIGIT</span>),
+];
+
+<span class='kw'>const</span> <span class='ident'>ALNUM</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>ALPHA</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>ASCII</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x7F&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>BLANK</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39; &#39;</span>, <span class='string'>&#39; &#39;</span>), (<span class='string'>&#39;\t&#39;</span>, <span class='string'>&#39;\t&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>CNTRL</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x1F&#39;</span>), (<span class='string'>&#39;\x7F&#39;</span>, <span class='string'>&#39;\x7F&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>DIGIT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>GRAPH</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;!&#39;</span>, <span class='string'>&#39;~&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>LOWER</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>PRINT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39; &#39;</span>, <span class='string'>&#39;~&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>PUNCT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;!&#39;</span>, <span class='string'>&#39;/&#39;</span>), (<span class='string'>&#39;:&#39;</span>, <span class='string'>&#39;@&#39;</span>), (<span class='string'>&#39;[&#39;</span>, <span class='string'>&#39;`&#39;</span>), (<span class='string'>&#39;{&#39;</span>, <span class='string'>&#39;~&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>SPACE</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\t&#39;</span>, <span class='string'>&#39;\t&#39;</span>), (<span class='string'>&#39;\n&#39;</span>, <span class='string'>&#39;\n&#39;</span>), (<span class='string'>&#39;\x0B&#39;</span>, <span class='string'>&#39;\x0B&#39;</span>),
+                       (<span class='string'>&#39;\x0C&#39;</span>, <span class='string'>&#39;\x0C&#39;</span>), (<span class='string'>&#39;\r&#39;</span>, <span class='string'>&#39;\r&#39;</span>), (<span class='string'>&#39; &#39;</span>, <span class='string'>&#39; &#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>UPPER</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>WORD</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>XDIGIT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;F&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;f&#39;</span>)];
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>tests</span> {
+    <span class='kw'>use</span> { <span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>, <span class='ident'>Expr</span>, <span class='ident'>Repeater</span>, <span class='ident'>ErrorKind</span> };
+    <span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>regex</span>::{<span class='ident'>PERLD</span>, <span class='ident'>PERLS</span>, <span class='ident'>PERLW</span>};
+    <span class='kw'>use</span> <span class='ident'>super</span>::<span class='ident'>Parser</span>;
+    <span class='kw'>use</span> <span class='ident'>super</span>::{<span class='ident'>LOWER</span>, <span class='ident'>UPPER</span>};
+
+    <span class='kw'>static</span> <span class='ident'>YI</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [(<span class='ident'>char</span>, <span class='ident'>char</span>)] <span class='op'>=</span> <span class='kw-2'>&amp;</span>[
+        (<span class='string'>&#39;\u{a000}&#39;</span>, <span class='string'>&#39;\u{a48c}&#39;</span>), (<span class='string'>&#39;\u{a490}&#39;</span>, <span class='string'>&#39;\u{a4c6}&#39;</span>),
+    ];
+
+    <span class='kw'>fn</span> <span class='ident'>p</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='ident'>s</span>).<span class='ident'>unwrap</span>() }
+    <span class='kw'>fn</span> <span class='ident'>lit</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>], <span class='ident'>casei</span>: <span class='boolval'>false</span> } }
+    <span class='kw'>fn</span> <span class='ident'>liti</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>], <span class='ident'>casei</span>: <span class='boolval'>true</span> } }
+    <span class='kw'>fn</span> <span class='ident'>b</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>(<span class='ident'>v</span>: <span class='ident'>T</span>) <span class='op'>-&gt;</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> { <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>v</span>) }
+    <span class='kw'>fn</span> <span class='ident'>c</span>(<span class='ident'>es</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>Expr</span>]) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='ident'>es</span>.<span class='ident'>to_vec</span>()) }
+
+    <span class='kw'>fn</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>ranges</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>()
+                           .<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)).<span class='ident'>collect</span>();
+        <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>ranges</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>classes</span>(<span class='ident'>classes</span>: <span class='kw-2'>&amp;</span>[<span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>();
+        <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='ident'>ranges</span> <span class='kw'>in</span> <span class='ident'>classes</span> {
+            <span class='ident'>cls</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>class</span>(<span class='ident'>ranges</span>));
+        }
+        <span class='ident'>cls</span>.<span class='ident'>canonicalize</span>()
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>empty</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Empty</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>literal_string</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;ab&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>start_literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;^a&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>StartText</span>,
+            <span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='string'>&#39;a&#39;</span>], <span class='ident'>casei</span>: <span class='boolval'>false</span> },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_one_greedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_one_greedy_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;ab?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+            },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_one_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a??&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_one_or_more_greedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a+&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>OneOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_one_or_more_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a+?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>OneOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_more_greedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a*&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_more_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a*?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_exact</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>5</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min_max</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,10}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>10</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_exact_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5}?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>5</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,}?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> },
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min_max_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,10}?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>10</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_whitespace</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{ 5   }&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>5</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{ 5 , 10 }&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>10</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_literal_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(ab)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_two</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a|b&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_many</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a|b|c&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_many_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;ab|bc|cd&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]),
+            <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)]),
+            <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;d&#39;</span>)]),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_two</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a|b)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_many</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a|b|c)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_many_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(ab|bc|cd)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]),
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)]),
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;d&#39;</span>)]),
+            ])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_nested</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(ab|(bc|(cd)))&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]),
+                <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                    <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+                        <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)]),
+                        <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;d&#39;</span>)])),
+                            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>3</span>),
+                            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+                        }
+                    ])),
+                    <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>2</span>),
+                    <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+                },
+            ])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_name</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?P&lt;foo&gt;a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='string'>&quot;foo&quot;</span>.<span class='ident'>into</span>()),
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_no_capture</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?:a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_flags</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i:a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_flags_returned</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i:a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_flags_retained</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)(?-i:a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)a&quot;</span>), <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_multiple</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?is)a.&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>Expr</span>::<span class='ident'>AnyChar</span>]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_multiline</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?m)^(?-m)$&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>Expr</span>::<span class='ident'>StartLine</span>, <span class='ident'>Expr</span>::<span class='ident'>EndText</span>]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_swap_greed</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?U)a*a*?(?i-U)a*a*?&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+            },
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+            },
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+            },
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+            },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_multiple_negate_one</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?is)a.(?i-s)a.&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>Expr</span>::<span class='ident'>AnyChar</span>, <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>Expr</span>::<span class='ident'>AnyCharNoNL</span>,
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)a(?-i)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_group_inline</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a(?i)a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)])),
+                <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_group_inline_retain</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)((?-i)a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_simple</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\a\f\t\n\r\v&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;\x07&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\x0C&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\t&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;\n&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\r&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\x0B&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_boundaries</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\A\z\b\B&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>StartText</span>, <span class='ident'>Expr</span>::<span class='ident'>EndText</span>,
+            <span class='ident'>Expr</span>::<span class='ident'>WordBoundary</span>, <span class='ident'>Expr</span>::<span class='ident'>NotWordBoundary</span>,
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_punctuation</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;\\&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;.&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;+&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;*&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;?&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;(&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;)&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;|&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;[&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;{&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;}&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;^&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;$&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_octal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\123&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\1234&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;4&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_hex2</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x53&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x534&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;4&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_hex</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x{53}&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x{53}4&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;4&#39;</span>)]));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x{2603}&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\u{2603}&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\p{Yi}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\pZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\p{Yi}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\pZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ]).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\P{Yi}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\PZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ]).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name_negate_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\P{Yi}&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter_negate_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\PZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ]).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\d&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\s&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\w&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\D&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\S&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\W&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\d&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\s&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\w&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d_case_fold_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\D&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s_case_fold_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\S&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w_case_fold_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\W&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[a]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\x00]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x00&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\n&#39;</span>, <span class='string'>&#39;\n&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\n&#39;</span>, <span class='string'>&#39;\n&#39;</span>)])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^a]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\x00]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x01&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x09&#39;</span>), (<span class='string'>&#39;\x0b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[^\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x09&#39;</span>), (<span class='string'>&#39;\x0b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\d]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\d]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\w]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\s]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\D]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\W]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\S]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[\d]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\d]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\w]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\s]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate_negate_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\D]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\W]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\S]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ]).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate_negate</span>() {
+        <span class='kw'>let</span> <span class='ident'>nperld</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>nyi</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>().<span class='ident'>merge</span>(<span class='ident'>nperld</span>).<span class='ident'>merge</span>(<span class='ident'>nyi</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\D\P{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ]).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ]).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate_negate_casei</span>() {
+        <span class='kw'>let</span> <span class='ident'>nperld</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>nyi</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>class</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>().<span class='ident'>merge</span>(<span class='ident'>nperld</span>).<span class='ident'>merge</span>(<span class='ident'>nyi</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\D\P{Yi}]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>.<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_class_hypen</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\p{Yi}-]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>)], <span class='ident'>YI</span>,
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\p{Yi}-a]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>)], <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)], <span class='ident'>YI</span>,
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_brackets</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;]&#39;</span>, <span class='string'>&#39;]&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[][]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;[&#39;</span>, <span class='string'>&#39;[&#39;</span>), (<span class='string'>&#39;]&#39;</span>, <span class='string'>&#39;]&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;[&#39;</span>, <span class='string'>&#39;[&#39;</span>)])),
+            <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_brackets_hypen</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[]-]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>), (<span class='string'>&#39;]&#39;</span>, <span class='string'>&#39;]&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[-]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>)])),
+            <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_overlapping</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[a-fd-h]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;h&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[a-fg-m]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;m&#39;</span>)])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[:upper:]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_not</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[:abc:]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;:&#39;</span>, <span class='string'>&#39;:&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>)])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_multiple</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:lower:][:upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>UPPER</span>, <span class='ident'>LOWER</span>])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>negate</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[^[:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_negate_multiple</span>() {
+        <span class='kw'>let</span> (<span class='ident'>nlower</span>, <span class='ident'>nupper</span>) <span class='op'>=</span> (<span class='ident'>class</span>(<span class='ident'>LOWER</span>).<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>negate</span>());
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>().<span class='ident'>merge</span>(<span class='ident'>nlower</span>).<span class='ident'>merge</span>(<span class='ident'>nupper</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:^lower:][:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[^[:^lower:][:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[:upper:]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[[:upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_negate_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[[:^upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[^[:^upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x) a b c&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_literal_off</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x) a b c(?-x) a&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39; &#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x)[a
+        - z
+]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x)[  ^   a
+        - z
+]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)]).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_escape</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)\ d&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)\
+                     D&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_comments</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)(?P&lt;foo&gt;
+    a # comment 1
+)(?P&lt;bar&gt;
+    z # comment 2
+)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+        <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='string'>&quot;foo&quot;</span>.<span class='ident'>into</span>()),
+        },
+        <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>lit</span>(<span class='string'>&#39;z&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>2</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='string'>&quot;bar&quot;</span>.<span class='ident'>into</span>()),
+        },
+    ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_comments_re_enable</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)a # hi
+(?-x:#) # sweet&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_escape_punctuation</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;\\&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;.&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;+&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;*&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;?&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;(&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;)&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;|&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;[&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;{&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;}&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;^&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;$&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_escape_hash</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)a\# # hi there&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>),
+        ]));
+    }
+
+    <span class='comment'>// Test every single possible error case.</span>
+
+    <span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>test_err</span> {
+        (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>re</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>pos</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>kind</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> {{
+            <span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>re</span>).<span class='ident'>unwrap_err</span>();
+            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>pos</span>, <span class='ident'>err</span>.<span class='ident'>pos</span>);
+            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>kind</span>, <span class='ident'>err</span>.<span class='ident'>kind</span>);
+            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>re</span>.<span class='ident'>contains</span>(<span class='kw-2'>&amp;</span><span class='ident'>err</span>.<span class='ident'>surround</span>));
+        }}
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_no_expr_simple</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(*&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_no_expr_counted</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;({5}&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_beginning_counted</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;{5}&quot;</span>, <span class='number'>0</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_illegal_exprs_simple</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a**&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        }));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|*&quot;</span>, <span class='number'>2</span>,
+            <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)]))
+        );
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_illegal_exprs_counted</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a*{5}&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        }));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|{5}&quot;</span>, <span class='number'>2</span>,
+            <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)]))
+        );
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_empty_number</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{}&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>MissingBase10</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{5&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedRepeat</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_empty_number_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{xyz&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;xyz&quot;</span>.<span class='ident'>into</span>()));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{12,xyz&quot;</span>, <span class='number'>8</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;xyz&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_invalid_number</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{9999999999}&quot;</span>, <span class='number'>12</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;9999999999&quot;</span>.<span class='ident'>into</span>()));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{1,9999999999}&quot;</span>, <span class='number'>14</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;9999999999&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_invalid_number_extra</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{12x}&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;12x&quot;</span>.<span class='ident'>into</span>()));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{1,12x}&quot;</span>, <span class='number'>7</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;12x&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_invalid_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{2,1}&quot;</span>, <span class='number'>5</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidRepeatRange</span> { <span class='ident'>min</span>: <span class='number'>2</span>, <span class='ident'>max</span>: <span class='number'>1</span> });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_alternate_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;|a&quot;</span>, <span class='number'>0</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_alternate_empty_with_group</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(|a)&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_alternate_empty_with_alternate</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a||&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_unopened_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;)&quot;</span>, <span class='number'>0</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_unopened</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;ab)&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_unopened_with_alt</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|b)&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_empty_alt</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(a|)&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_empty_group</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;()&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyGroup</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_empty_group_with_name</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;foo&gt;)&quot;</span>, <span class='number'>8</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyGroup</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_finish_concat_unclosed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;ab(xy&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_finish_concat_empty_alt</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_invalid</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;a#&gt;x)&quot;</span>, <span class='number'>6</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidCaptureName</span>(<span class='string'>&quot;a#&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_invalid_leading</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;1a&gt;a)&quot;</span>, <span class='number'>6</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidCaptureName</span>(<span class='string'>&quot;1a&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_unexpected_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;a&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedCaptureName</span>(<span class='string'>&quot;a&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;&gt;a)&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyCaptureName</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_unrecognized_flag</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?z:a)&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedFlag</span>(<span class='string'>&#39;z&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_unexpected_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?i&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedFlagEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_double_negation</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?-i-s:a)&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>DoubleFlagNegation</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_empty_negation</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?i-:a)&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?)&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_unexpected_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_unrecognized</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\m&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedEscape</span>(<span class='string'>&#39;m&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex2_eof0</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedTwoDigitHexEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex2_eof1</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\xA&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedTwoDigitHexEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex2_invalid</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\xAG&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;AG&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_eof0</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_eof1</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{A&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedHex</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{AG}&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;AG&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid_scalar_value_surrogate</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{D800}&quot;</span>, <span class='number'>7</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidScalarValue</span>(<span class='number'>0xD800</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid_scalar_value_high</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{110000}&quot;</span>, <span class='number'>9</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidScalarValue</span>(<span class='number'>0x110000</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid_u32</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{9999999999}&quot;</span>, <span class='number'>13</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;9999999999&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_unclosed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p{&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedUnicodeName</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p{Greek&quot;</span>, <span class='number'>8</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedUnicodeName</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_no_letter</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_unknown_letter</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\pA&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='string'>&quot;A&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_unknown_name</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p{Yii}&quot;</span>, <span class='number'>7</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='string'>&quot;Yii&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_eof_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_eof_non_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[a&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^a&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_eof_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[a-&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^a-&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[---&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_invalid_escape</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[\pA]&quot;</span>, <span class='number'>4</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='string'>&quot;A&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_valid_escape_not_allowed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[\A]&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_range_valid_escape_not_allowed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[a-\d]&quot;</span>, <span class='number'>5</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>))));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[a-\A]&quot;</span>, <span class='number'>5</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[\A-a]&quot;</span>, <span class='number'>3</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_invalid_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[z-a]&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassRange</span> {
+            <span class='ident'>start</span>: <span class='string'>&#39;z&#39;</span>,
+            <span class='ident'>end</span>: <span class='string'>&#39;a&#39;</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_empty_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[]&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^]&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_duplicate_capture_name</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;a&gt;.)(?P&lt;a&gt;.)&quot;</span>, <span class='number'>14</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>DuplicateCaptureName</span>(<span class='string'>&quot;a&quot;</span>.<span class='ident'>into</span>()));
+    }
+}
+</pre>
+</section>
+    <section id='search' class="content hidden"></section>
+
+    <section class="footer"></section>
+
+    <div id="help" class="hidden">
+        <div class="shortcuts">
+            <h1>Keyboard shortcuts</h1>
+            <dl>
+                <dt>?</dt>
+                <dd>Show this help dialog</dd>
+                <dt>S</dt>
+                <dd>Focus the search field</dd>
+                <dt>&larrb;</dt>
+                <dd>Move up in search results</dd>
+                <dt>&rarrb;</dt>
+                <dd>Move down in search results</dd>
+                <dt>&#9166;</dt>
+                <dd>Go to active search result</dd>
+            </dl>
+        </div>
+        <div class="infos">
+            <h1>Search tricks</h1>
+            <p>
+                Prefix searches with a type followed by a colon (e.g.
+                <code>fn:</code>) to restrict the search to a given type.
+            </p>
+            <p>
+                Accepted types are: <code>fn</code>, <code>mod</code>,
+                <code>struct</code>, <code>enum</code>,
+                <code>trait</code>, <code>typedef</code> (or
+                <code>tdef</code>).
+            </p>
+            <p>
+                Search functions by type signature (e.g.
+                <code>vec -> usize</code>)
+            </p>
+        </div>
+    </div>
+
+    
+
+    <script>
+        window.rootPath = "../../";
+        window.currentCrate = "regex_syntax";
+        window.playgroundUrl = "";
+    </script>
+    <script src="../../jquery.js"></script>
+    <script src="../../main.js"></script>
+    
+    <script async src="../../search-index.js"></script>
+</body>
+</html>
+\ No newline at end of file
author		2015-06-29 20:16:15 +0000
committer		2015-06-29 20:16:15 +0000
commit	64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree	8c64d6e8be006486d975a651505fbbde61365cd6 /src/regex_syntax
download	irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.tar.gz irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.tar.xz irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.zip