Update documentationgh-pages

author: 2015-06-29 20:16:15 +0000
committer: 2015-06-29 20:16:15 +0000
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tree: 8c64d6e8be006486d975a651505fbbde61365cd6 /src/regex_syntax/parser.rs.html
download: irsc-gh-pages.tar.gz
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">   1</span>
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+<span id="2242">2242</span>
+<span id="2243">2243</span>
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+<span id="2250">2250</span>
+<span id="2251">2251</span>
+<span id="2252">2252</span>
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+<span id="2257">2257</span>
+<span id="2258">2258</span>
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+<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>
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+<span id="2306">2306</span>
+<span id="2307">2307</span>
+<span id="2308">2308</span>
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+<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>
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+\ 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/parser.rs.html
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