Update documentationgh-pages

author: 2015-06-29 20:16:15 +0000
committer: 2015-06-29 20:16:15 +0000
commit: 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree: 8c64d6e8be006486d975a651505fbbde61365cd6 /src/regex_syntax
download: irsc-gh-pages.tar.gz
irsc-gh-pages.tar.xz
irsc-gh-pages.zip
2 files changed, 7216 insertions, 0 deletions
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">   1</span>
+<span id="2">   2</span>
+<span id="3">   3</span>
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+<span id="1173">1173</span>
+<span id="1174">1174</span>
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+<span id="1176">1176</span>
+<span id="1177">1177</span>
+<span id="1178">1178</span>
+<span id="1179">1179</span>
+<span id="1180">1180</span>
+<span id="1181">1181</span>
+<span id="1182">1182</span>
+<span id="1183">1183</span>
+<span id="1184">1184</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
+<span class='comment'>// file at the top-level directory of this distribution and at</span>
+<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
+<span class='comment'>//</span>
+<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
+<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
+<span class='comment'>// except according to those terms.</span>
+
+<span class='doccomment'>/*!
+This crate provides a regular expression parser and an abstract syntax for
+regular expressions. The abstract syntax is defined by the `Expr` type. The
+concrete syntax is enumerated in the
+[`regex`](../regex/index.html#syntax)
+crate documentation.
+
+Note that since this crate is first and foremost an implementation detail for
+the `regex` crate, it may experience more frequent breaking changes. It is
+exposed as a separate crate so that others may use it to do analysis on regular
+expressions or even build their own matching engine.
+
+# Example: parsing an expression
+
+Parsing a regular expression can be done with the `Expr::parse` function.
+
+```rust
+use regex_syntax::Expr;
+
+assert_eq!(Expr::parse(r&quot;ab|yz&quot;).unwrap(), Expr::Alternate(vec![
+    Expr::Literal { chars: vec![&#39;a&#39;, &#39;b&#39;], casei: false },
+    Expr::Literal { chars: vec![&#39;y&#39;, &#39;z&#39;], casei: false },
+]));
+```
+
+# Example: inspecting an error
+
+The parser in this crate provides very detailed error values. For example,
+if an invalid character class range is given:
+
+```rust
+use regex_syntax::{Expr, ErrorKind};
+
+let err = Expr::parse(r&quot;[z-a]&quot;).unwrap_err();
+assert_eq!(err.position(), 4);
+assert_eq!(err.kind(), &amp;ErrorKind::InvalidClassRange {
+    start: &#39;z&#39;,
+    end: &#39;a&#39;,
+});
+```
+
+Or unbalanced parentheses:
+
+```rust
+use regex_syntax::{Expr, ErrorKind};
+
+let err = Expr::parse(r&quot;ab(cd&quot;).unwrap_err();
+assert_eq!(err.position(), 2);
+assert_eq!(err.kind(), &amp;ErrorKind::UnclosedParen);
+```
+*/</span>
+
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>deny</span>(<span class='ident'>missing_docs</span>)]</span>
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>quickcheck</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>rand</span>;
+
+<span class='kw'>mod</span> <span class='ident'>parser</span>;
+<span class='kw'>mod</span> <span class='ident'>unicode</span>;
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::{<span class='ident'>Ordering</span>, <span class='ident'>max</span>, <span class='ident'>min</span>};
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>IntoIterator</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>slice</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>vec</span>;
+
+<span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>case_folding</span>;
+
+<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Expr</span>::<span class='op'>*</span>;
+<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Repeater</span>::<span class='op'>*</span>;
+
+<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>;
+
+<span class='doccomment'>/// A regular expression abstract syntax tree.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// An `Expr` represents the abstract syntax of a regular expression.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Expr</span> {
+    <span class='doccomment'>/// An empty regex (which never matches any text).</span>
+    <span class='ident'>Empty</span>,
+    <span class='doccomment'>/// A sequence of one or more literal characters to be matched.</span>
+    <span class='ident'>Literal</span> {
+        <span class='doccomment'>/// The characters.</span>
+        <span class='ident'>chars</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// Whether to match case insensitively.</span>
+        <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+    },
+    <span class='doccomment'>/// Match any character, excluding new line.</span>
+    <span class='ident'>AnyChar</span>,
+    <span class='doccomment'>/// Match any character.</span>
+    <span class='ident'>AnyCharNoNL</span>,
+    <span class='doccomment'>/// A character class.</span>
+    <span class='ident'>Class</span>(<span class='ident'>CharClass</span>),
+    <span class='doccomment'>/// Match the start of a line or beginning of input.</span>
+    <span class='ident'>StartLine</span>,
+    <span class='doccomment'>/// Match the end of a line or end of input.</span>
+    <span class='ident'>EndLine</span>,
+    <span class='doccomment'>/// Match the beginning of input.</span>
+    <span class='ident'>StartText</span>,
+    <span class='doccomment'>/// Match the end of input.</span>
+    <span class='ident'>EndText</span>,
+    <span class='doccomment'>/// Match a word boundary (word character on one side and a non-word</span>
+    <span class='doccomment'>/// character on the other).</span>
+    <span class='ident'>WordBoundary</span>,
+    <span class='doccomment'>/// Match a position that is not a word boundary (word or non-word</span>
+    <span class='doccomment'>/// characters on both sides).</span>
+    <span class='ident'>NotWordBoundary</span>,
+    <span class='doccomment'>/// A group, possibly non-capturing.</span>
+    <span class='ident'>Group</span> {
+        <span class='doccomment'>/// The expression inside the group.</span>
+        <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// The capture index (starting at `1`) only for capturing groups.</span>
+        <span class='ident'>i</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// The capture name, only for capturing named groups.</span>
+        <span class='ident'>name</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>,
+    },
+    <span class='doccomment'>/// A repeat operator (`?`, `*`, `+` or `{m,n}`).</span>
+    <span class='ident'>Repeat</span> {
+        <span class='doccomment'>/// The expression to be repeated. Limited to literals, `.`, classes</span>
+        <span class='doccomment'>/// or grouped expressions.</span>
+        <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>,
+        <span class='doccomment'>/// The type of repeat operator used.</span>
+        <span class='ident'>r</span>: <span class='ident'>Repeater</span>,
+        <span class='doccomment'>/// Whether the repeat is greedy (match the most) or not (match the</span>
+        <span class='doccomment'>/// least).</span>
+        <span class='ident'>greedy</span>: <span class='ident'>bool</span>,
+    },
+    <span class='doccomment'>/// A concatenation of expressions. Must be matched one after the other.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// N.B. A concat expression can only appear at the top-level or</span>
+    <span class='doccomment'>/// immediately inside a group expression.</span>
+    <span class='ident'>Concat</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>),
+    <span class='doccomment'>/// An alternation of expressions. Only one must match.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// N.B. An alternate expression can only appear at the top-level or</span>
+    <span class='doccomment'>/// immediately inside a group expression.</span>
+    <span class='ident'>Alternate</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>),
+}
+
+<span class='kw'>type</span> <span class='ident'>CaptureIndex</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>;
+
+<span class='kw'>type</span> <span class='ident'>CaptureName</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// The type of a repeat operator expression.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Repeater</span> {
+    <span class='doccomment'>/// Match zero or one (`?`).</span>
+    <span class='ident'>ZeroOrOne</span>,
+    <span class='doccomment'>/// Match zero or more (`*`).</span>
+    <span class='ident'>ZeroOrMore</span>,
+    <span class='doccomment'>/// Match one or more (`+`).</span>
+    <span class='ident'>OneOrMore</span>,
+    <span class='doccomment'>/// Match for at least `min` and at most `max` (`{m,n}`).</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// When `max` is `None`, there is no upper bound on the number of matches.</span>
+    <span class='ident'>Range</span> {
+        <span class='doccomment'>/// Lower bound on the number of matches.</span>
+        <span class='ident'>min</span>: <span class='ident'>u32</span>,
+        <span class='doccomment'>/// Optional upper bound on the number of matches.</span>
+        <span class='ident'>max</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span>,
+    },
+}
+
+<span class='doccomment'>/// A character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// A character class has a canonical format that the parser guarantees. Its</span>
+<span class='doccomment'>/// canonical format is defined by the following invariants:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// 1. Given any Unicode scalar value, it is matched by *at most* one character</span>
+<span class='doccomment'>///    range in a canonical character class.</span>
+<span class='doccomment'>/// 2. Every adjacent character range is separated by at least one Unicode</span>
+<span class='doccomment'>///    scalar value.</span>
+<span class='doccomment'>/// 3. Given any pair of character ranges `r1` and `r2`, if</span>
+<span class='doccomment'>///    `r1.end &lt; r2.start`, then `r1` comes before `r2` in a canonical</span>
+<span class='doccomment'>///    character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// In sum, any `CharClass` produced by this crate&#39;s parser is a sorted</span>
+<span class='doccomment'>/// sequence of non-overlapping ranges. This makes it possible to test whether</span>
+<span class='doccomment'>/// a character is matched by a class with a binary search.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Additionally, a character class may be marked *case insensitive*. If it&#39;s</span>
+<span class='doccomment'>/// case insensitive, then:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// 1. Simple case folding has been applied to all ranges.</span>
+<span class='doccomment'>/// 2. Simple case folding must be applied to a character before testing</span>
+<span class='doccomment'>///    whether it matches the character class.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>CharClass</span> {
+    <span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>,
+    <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+}
+
+<span class='doccomment'>/// A single inclusive range in a character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Since range boundaries are defined by Unicode scalar values, the boundaries</span>
+<span class='doccomment'>/// can never be in the open interval `(0xD7FF, 0xE000)`. However, a range may</span>
+<span class='doccomment'>/// *cover* codepoints that are not scalar values.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Note that this has a few convenient impls on `PartialEq` and `PartialOrd`</span>
+<span class='doccomment'>/// for testing whether a character is contained inside a given range.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>PartialOrd</span>, <span class='ident'>Eq</span>, <span class='ident'>Ord</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ClassRange</span> {
+    <span class='doccomment'>/// The start character of the range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This must be less than or equal to `end`.</span>
+    <span class='kw'>pub</span> <span class='ident'>start</span>: <span class='ident'>char</span>,
+
+    <span class='doccomment'>/// The end character of the range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This must be greater than or equal to `end`.</span>
+    <span class='kw'>pub</span> <span class='ident'>end</span>: <span class='ident'>char</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Expr</span> {
+    <span class='doccomment'>/// Parses a string in a regular expression syntax tree.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='ident'>parser</span>::<span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='ident'>s</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>())
+    }
+
+    <span class='doccomment'>/// Returns true iff the expression can be repeated by a quantifier.</span>
+    <span class='kw'>fn</span> <span class='ident'>can_repeat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>Literal</span>{..}
+            <span class='op'>|</span> <span class='ident'>AnyChar</span>
+            <span class='op'>|</span> <span class='ident'>AnyCharNoNL</span>
+            <span class='op'>|</span> <span class='ident'>Class</span>(_)
+            <span class='op'>|</span> <span class='ident'>StartLine</span> <span class='op'>|</span> <span class='ident'>EndLine</span> <span class='op'>|</span> <span class='ident'>StartText</span> <span class='op'>|</span> <span class='ident'>EndText</span>
+            <span class='op'>|</span> <span class='ident'>WordBoundary</span> <span class='op'>|</span> <span class='ident'>NotWordBoundary</span>
+            <span class='op'>|</span> <span class='ident'>Group</span>{..}
+            <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+            _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>simplify</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> {
+        <span class='kw'>fn</span> <span class='ident'>combine_literals</span>(<span class='ident'>es</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>, <span class='ident'>e</span>: <span class='ident'>Expr</span>) {
+            <span class='kw'>match</span> (<span class='ident'>es</span>.<span class='ident'>pop</span>(), <span class='ident'>e</span>) {
+                (<span class='prelude-val'>None</span>, <span class='ident'>e</span>) <span class='op'>=&gt;</span> <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e</span>),
+                (<span class='prelude-val'>Some</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='kw-2'>mut</span> <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> }),
+                 <span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> }) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>casei1</span> <span class='op'>==</span> <span class='ident'>casei2</span> {
+                        <span class='ident'>chars1</span>.<span class='ident'>extend</span>(<span class='ident'>chars2</span>);
+                        <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> });
+                    } <span class='kw'>else</span> {
+                        <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> });
+                        <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> });
+                    }
+                }
+                (<span class='prelude-val'>Some</span>(<span class='ident'>e1</span>), <span class='ident'>e2</span>) <span class='op'>=&gt;</span> {
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e1</span>);
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e2</span>);
+                }
+            }
+        }
+        <span class='kw'>match</span> <span class='self'>self</span> {
+            <span class='ident'>Repeat</span> { <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=&gt;</span> <span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>.<span class='ident'>simplify</span>()),
+                <span class='ident'>r</span>: <span class='ident'>r</span>,
+                <span class='ident'>greedy</span>: <span class='ident'>greedy</span>,
+            },
+            <span class='ident'>Group</span> { <span class='ident'>e</span>, <span class='ident'>i</span>, <span class='ident'>name</span> } <span class='op'>=&gt;</span> {
+                <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>();
+                <span class='kw'>if</span> <span class='ident'>i</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>name</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+                    <span class='ident'>e</span>
+                } <span class='kw'>else</span> {
+                    <span class='ident'>Group</span> { <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>), <span class='ident'>i</span>: <span class='ident'>i</span>, <span class='ident'>name</span>: <span class='ident'>name</span> }
+                }
+            }
+            <span class='ident'>Concat</span>(<span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+                <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_es</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>es</span>.<span class='ident'>len</span>());
+                <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> {
+                    <span class='ident'>combine_literals</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>new_es</span>, <span class='ident'>e</span>.<span class='ident'>simplify</span>());
+                }
+                <span class='kw'>if</span> <span class='ident'>new_es</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span> {
+                    <span class='ident'>new_es</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>()
+                } <span class='kw'>else</span> {
+                    <span class='ident'>Concat</span>(<span class='ident'>new_es</span>)
+                }
+            }
+            <span class='ident'>Alternate</span>(<span class='ident'>es</span>) <span class='op'>=&gt;</span> <span class='ident'>Alternate</span>(<span class='ident'>es</span>.<span class='ident'>into_iter</span>()
+                                         .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>())
+                                         .<span class='ident'>collect</span>()),
+            <span class='ident'>e</span> <span class='op'>=&gt;</span> <span class='ident'>e</span>,
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>ranges</span> }
+}
+
+<span class='kw'>impl</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>ClassRange</span>;
+    <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>into_iter</span>() }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>ClassRange</span>;
+    <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>iter</span>() }
+}
+
+<span class='kw'>impl</span> <span class='ident'>CharClass</span> {
+    <span class='doccomment'>/// Create a new class from an existing set of ranges.</span>
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>ranges</span>, <span class='ident'>casei</span>: <span class='boolval'>false</span> }
+    }
+
+    <span class='doccomment'>/// Create an empty class.</span>
+    <span class='kw'>fn</span> <span class='ident'>empty</span>() <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>Vec</span>::<span class='ident'>new</span>())
+    }
+
+    <span class='doccomment'>/// Returns true if `c` is matched by this character class.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// If this character class is case insensitive, then simple case folding</span>
+    <span class='doccomment'>/// is applied to `c` before checking for a match.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>matches</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='kw-2'>mut</span> <span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_case_insensitive</span>() {
+            <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>)
+        }
+        <span class='self'>self</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='ident'>range</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>partial_cmp</span>(<span class='ident'>range</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>()
+    }
+
+    <span class='doccomment'>/// Returns true if this character class should be matched case</span>
+    <span class='doccomment'>/// insensitively.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// When `true`, simple case folding has already been applied to the</span>
+    <span class='doccomment'>/// class.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_case_insensitive</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='self'>self</span>.<span class='ident'>casei</span>
+    }
+
+    <span class='doccomment'>/// Create a new empty class from this one.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Namely, its capacity and case insensitive setting will be the same.</span>
+    <span class='kw'>fn</span> <span class='ident'>to_empty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='self'>self</span>.<span class='ident'>len</span>()), <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>casei</span> }
+    }
+
+    <span class='doccomment'>/// Merge two classes and canonicalize them.</span>
+    <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+    <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>CharClass</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>other</span>);
+        <span class='self'>self</span>.<span class='ident'>canonicalize</span>()
+    }
+
+    <span class='doccomment'>/// Canonicalze any sequence of ranges.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This is responsible for enforcing the canonical format invariants</span>
+    <span class='doccomment'>/// as described on the docs for the `CharClass` type.</span>
+    <span class='kw'>fn</span> <span class='ident'>canonicalize</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='comment'>// TODO: Save some cycles here by checking if already canonicalized.</span>
+        <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>sort</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ordered</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>(); <span class='comment'>// TODO: Do this in place?</span>
+        <span class='kw'>for</span> <span class='ident'>candidate</span> <span class='kw'>in</span> <span class='self'>self</span> {
+            <span class='comment'>// If the candidate overlaps with an existing range, then it must</span>
+            <span class='comment'>// be the most recent range added because we process the candidates</span>
+            <span class='comment'>// in order.</span>
+            <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>or</span>) <span class='op'>=</span> <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>last_mut</span>() {
+                <span class='kw'>if</span> <span class='ident'>or</span>.<span class='ident'>overlapping</span>(<span class='ident'>candidate</span>) {
+                    <span class='op'>*</span><span class='ident'>or</span> <span class='op'>=</span> <span class='ident'>or</span>.<span class='ident'>merge</span>(<span class='ident'>candidate</span>);
+                    <span class='kw'>continue</span>;
+                }
+            }
+            <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>candidate</span>);
+        }
+        <span class='ident'>ordered</span>
+    }
+
+    <span class='doccomment'>/// Negates the character class.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// For all `c` where `c` is a Unicode scalar value, `c` matches `self`</span>
+    <span class='doccomment'>/// if and only if `c` does not match `self.negate()`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Note that this cannot be called on a character class that has had</span>
+    <span class='doccomment'>/// case folding applied to it. (Because case folding turns on a flag</span>
+    <span class='doccomment'>/// and doesn&#39;t store every possible matching character. Therefore,</span>
+    <span class='doccomment'>/// its negation is tricky to get right. Turns out, we don&#39;t need it</span>
+    <span class='doccomment'>/// anyway!)</span>
+    <span class='kw'>fn</span> <span class='ident'>negate</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>fn</span> <span class='ident'>range</span>(<span class='ident'>s</span>: <span class='ident'>char</span>, <span class='ident'>e</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> { <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>s</span>, <span class='ident'>e</span>) }
+
+        <span class='comment'>// Never allow negating of a class that has been case folded!</span>
+        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='self'>self</span>.<span class='ident'>casei</span>);
+
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_empty</span>() { <span class='kw'>return</span> <span class='self'>self</span>; }
+        <span class='self'>self</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>canonicalize</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inv</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span> <span class='op'>&gt;</span> <span class='string'>&#39;\x00&#39;</span> {
+            <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='string'>&#39;\x00&#39;</span>, <span class='ident'>dec_char</span>(<span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span>)));
+        }
+        <span class='kw'>for</span> <span class='ident'>win</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>windows</span>(<span class='number'>2</span>) {
+            <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='ident'>win</span>[<span class='number'>0</span>].<span class='ident'>end</span>),
+                                  <span class='ident'>dec_char</span>(<span class='ident'>win</span>[<span class='number'>1</span>].<span class='ident'>start</span>)));
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span> <span class='op'>&lt;</span> <span class='ident'>char</span>::<span class='ident'>MAX</span> {
+            <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span>),
+                                  <span class='ident'>char</span>::<span class='ident'>MAX</span>));
+        }
+        <span class='ident'>inv</span>
+    }
+
+    <span class='doccomment'>/// Apply case folding to this character class.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// One a class had been case folded, it cannot be negated.</span>
+    <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>folded</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>();
+        <span class='ident'>folded</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+        <span class='kw'>for</span> <span class='ident'>r</span> <span class='kw'>in</span> <span class='self'>self</span> {
+            <span class='comment'>// Applying case folding to a range is expensive because *every*</span>
+            <span class='comment'>// character needed to be examined. Thus, we avoid that drudgery</span>
+            <span class='comment'>// if no character in the current range is in our case folding</span>
+            <span class='comment'>// table.</span>
+            <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>needs_case_folding</span>() {
+                <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>r</span>.<span class='ident'>case_fold</span>());
+            } <span class='kw'>else</span> {
+                <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>r</span>);
+            }
+        }
+        <span class='ident'>folded</span>.<span class='ident'>canonicalize</span>()
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>ClassRange</span> {
+    <span class='doccomment'>/// Create a new class range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// If `end &lt; start`, then the two values are swapped so that</span>
+    <span class='doccomment'>/// the invariant `start &lt;= end` is preserved.</span>
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>start</span>: <span class='ident'>char</span>, <span class='ident'>end</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+        <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>&lt;=</span> <span class='ident'>end</span> {
+            <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>start</span>, <span class='ident'>end</span>: <span class='ident'>end</span> }
+        } <span class='kw'>else</span> {
+            <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>end</span>, <span class='ident'>end</span>: <span class='ident'>start</span> }
+        }
+    }
+
+    <span class='doccomment'>/// Create a range of one character.</span>
+    <span class='kw'>fn</span> <span class='ident'>one</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+        <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>c</span>, <span class='ident'>end</span>: <span class='ident'>c</span> }
+    }
+
+    <span class='doccomment'>/// Returns true if and only if the two ranges are overlapping. Note that</span>
+    <span class='doccomment'>/// since ranges are inclusive, `a-c` and `d-f` are overlapping!</span>
+    <span class='kw'>fn</span> <span class='ident'>overlapping</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>) <span class='op'>&lt;=</span> <span class='ident'>inc_char</span>(<span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>))
+    }
+
+    <span class='doccomment'>/// Creates a new range representing the union of `self` and `other.</span>
+    <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+        <span class='ident'>ClassRange</span> {
+            <span class='ident'>start</span>: <span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>),
+            <span class='ident'>end</span>: <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>),
+        }
+    }
+
+    <span class='doccomment'>/// Returns true if and only if this range contains a character that is</span>
+    <span class='doccomment'>/// in the case folding table.</span>
+    <span class='kw'>fn</span> <span class='ident'>needs_case_folding</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>
+        .<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>c</span>, _)<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>()
+    }
+
+    <span class='doccomment'>/// Apply case folding to this range.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Since case folding might add characters such that the range is no</span>
+    <span class='doccomment'>/// longer contiguous, this returns multiple class ranges. They are in</span>
+    <span class='doccomment'>/// canonical order.</span>
+    <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>start</span> <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='self'>self</span>.<span class='ident'>end</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='self'>self</span>.<span class='ident'>start</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>start</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>start</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='number'>100</span>);
+        <span class='kw'>for</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='kw'>in</span> (<span class='ident'>s</span><span class='op'>+</span><span class='number'>1</span>..<span class='ident'>e</span>).<span class='ident'>filter_map</span>(<span class='ident'>char</span>::<span class='ident'>from_u32</span>) {
+            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='ident'>next_case_fold</span> {
+                <span class='ident'>c</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>) {
+                    <span class='prelude-val'>Ok</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>,
+                    <span class='prelude-val'>Err</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> {
+                        <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&lt;</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>len</span>() {
+                            <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>0</span>;
+                        } <span class='kw'>else</span> {
+                            <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='string'>&#39;\u{10FFFF}&#39;</span>
+                        }
+                        <span class='ident'>c</span>
+                    }
+                };
+            }
+            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='ident'>inc_char</span>(<span class='ident'>end</span>) {
+                <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+                <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>c</span>;
+            }
+            <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>c</span>;
+        }
+        <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+        <span class='ident'>ranges</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='self'>self</span>.<span class='ident'>start</span> <span class='op'>&lt;=</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&amp;&amp;</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&lt;=</span> <span class='self'>self</span>.<span class='ident'>end</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>other</span>.<span class='ident'>eq</span>(<span class='self'>self</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='prelude-val'>Some</span>(<span class='kw'>if</span> <span class='self'>self</span> <span class='op'>==</span> <span class='ident'>other</span> {
+            <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
+        } <span class='kw'>else</span> <span class='kw'>if</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&gt;</span> <span class='self'>self</span>.<span class='ident'>end</span> {
+            <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
+        } <span class='kw'>else</span> {
+            <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
+        })
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='ident'>other</span>.<span class='ident'>partial_cmp</span>(<span class='self'>self</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>o</span><span class='op'>|</span> <span class='ident'>o</span>.<span class='ident'>reverse</span>())
+    }
+}
+
+<span class='doccomment'>/// This implementation of `Display` will write a regular expression from the</span>
+<span class='doccomment'>/// syntax tree. It does not write the original string parsed.</span>
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Expr</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>Empty</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;&quot;</span>),
+            <span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, <span class='ident'>casei</span> } <span class='op'>=&gt;</span> {
+                <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?i:&quot;</span>)); }
+                <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>chars</span> {
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>quote_char</span>(<span class='ident'>c</span>)));
+                }
+                <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;)&quot;</span>)); }
+                <span class='prelude-val'>Ok</span>(())
+            }
+            <span class='ident'>AnyChar</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?s:.)&quot;</span>),
+            <span class='ident'>AnyCharNoNL</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;.&quot;</span>),
+            <span class='ident'>Class</span>(<span class='kw-2'>ref</span> <span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>cls</span>),
+            <span class='ident'>StartLine</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?m:^)&quot;</span>),
+            <span class='ident'>EndLine</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?m:$)&quot;</span>),
+            <span class='ident'>StartText</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;^&quot;</span>),
+            <span class='ident'>EndText</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;$&quot;</span>),
+            <span class='ident'>WordBoundary</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;\b&quot;</span>),
+            <span class='ident'>NotWordBoundary</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;\B&quot;</span>),
+            <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>i</span>: <span class='prelude-val'>None</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span> } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?:{})&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span>, .. } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;({})&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>), .. } <span class='op'>=&gt;</span> {
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?P&lt;{}&gt;{})&quot;</span>, <span class='ident'>n</span>, <span class='ident'>e</span>)
+            }
+            <span class='ident'>Repeat</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=&gt;</span> {
+                <span class='kw'>match</span> <span class='kw-2'>&amp;</span><span class='op'>*</span><span class='op'>*</span><span class='ident'>e</span> {
+                    <span class='kw-2'>&amp;</span><span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, .. } <span class='kw'>if</span> <span class='ident'>chars</span>.<span class='ident'>len</span>() <span class='op'>&gt;</span> <span class='number'>1</span> <span class='op'>=&gt;</span> {
+                        <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?:{}){}&quot;</span>, <span class='ident'>e</span>, <span class='ident'>r</span>))
+                    }
+                    _ <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}{}&quot;</span>, <span class='ident'>e</span>, <span class='ident'>r</span>)),
+                }
+                <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>greedy</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;?&quot;</span>)); }
+                <span class='prelude-val'>Ok</span>(())
+            }
+            <span class='ident'>Concat</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+                <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> {
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>e</span>));
+                }
+                <span class='prelude-val'>Ok</span>(())
+            }
+            <span class='ident'>Alternate</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+                <span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>e</span>) <span class='kw'>in</span> <span class='ident'>es</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
+                    <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&gt;</span> <span class='number'>0</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;|&quot;</span>)); }
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>e</span>));
+                }
+                <span class='prelude-val'>Ok</span>(())
+            }
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Repeater</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>ZeroOrOne</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;?&quot;</span>),
+            <span class='ident'>ZeroOrMore</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;*&quot;</span>),
+            <span class='ident'>OneOrMore</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;+&quot;</span>),
+            <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{},}}&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='kw'>if</span> <span class='ident'>s</span> <span class='op'>==</span> <span class='ident'>e</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{}}}&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{}, {}}}&quot;</span>, <span class='ident'>s</span>, <span class='ident'>e</span>),
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> {
+            <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?i:&quot;</span>));
+        }
+        <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;[&quot;</span>));
+        <span class='kw'>for</span> <span class='ident'>range</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>iter</span>() {
+            <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>range</span>));
+        }
+        <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;]&quot;</span>));
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> {
+            <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;)&quot;</span>));
+        }
+        <span class='prelude-val'>Ok</span>(())
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}-{}&quot;</span>, <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>start</span>), <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>end</span>))
+    }
+}
+
+<span class='doccomment'>/// An alias for computations that can return a `Error`.</span>
+<span class='kw'>pub</span> <span class='kw'>type</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='op'>=</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>Error</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// A parse error.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This includes details about the specific type of error and a rough</span>
+<span class='doccomment'>/// approximation of where it occurred.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Error</span> {
+    <span class='ident'>pos</span>: <span class='ident'>usize</span>,
+    <span class='ident'>surround</span>: <span class='ident'>String</span>,
+    <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>,
+}
+
+<span class='doccomment'>/// The specific type of parse error that can occur.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>ErrorKind</span> {
+    <span class='doccomment'>/// A negation symbol is used twice in flag settings.</span>
+    <span class='doccomment'>/// e.g., `(?-i-s)`.</span>
+    <span class='ident'>DoubleFlagNegation</span>,
+    <span class='doccomment'>/// The same capture name was used more than once.</span>
+    <span class='doccomment'>/// e.g., `(?P&lt;a&gt;.)(?P&lt;a&gt;.)`.</span>
+    <span class='ident'>DuplicateCaptureName</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An alternate is empty. e.g., `(|a)`.</span>
+    <span class='ident'>EmptyAlternate</span>,
+    <span class='doccomment'>/// A capture group name is empty. e.g., `(?P&lt;&gt;a)`.</span>
+    <span class='ident'>EmptyCaptureName</span>,
+    <span class='doccomment'>/// A negation symbol was not proceded by any flags. e.g., `(?i-)`.</span>
+    <span class='ident'>EmptyFlagNegation</span>,
+    <span class='doccomment'>/// A group is empty. e.g., `()`.</span>
+    <span class='ident'>EmptyGroup</span>,
+    <span class='doccomment'>/// An invalid number was used in a counted repetition. e.g., `a{b}`.</span>
+    <span class='ident'>InvalidBase10</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An invalid hexadecimal number was used in an escape sequence.</span>
+    <span class='doccomment'>/// e.g., `\xAG`.</span>
+    <span class='ident'>InvalidBase16</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An invalid capture name was used. e.g., `(?P&lt;0a&gt;b)`.</span>
+    <span class='ident'>InvalidCaptureName</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An invalid class range was givien. Specifically, when the start of the</span>
+    <span class='doccomment'>/// range is greater than the end. e.g., `[z-a]`.</span>
+    <span class='ident'>InvalidClassRange</span> {
+        <span class='doccomment'>/// The first character specified in the range.</span>
+        <span class='ident'>start</span>: <span class='ident'>char</span>,
+        <span class='doccomment'>/// The second character specified in the range.</span>
+        <span class='ident'>end</span>: <span class='ident'>char</span>,
+    },
+    <span class='doccomment'>/// An escape sequence was used in a character class where it is not</span>
+    <span class='doccomment'>/// allowed. e.g., `[a-\pN]` or `[\A]`.</span>
+    <span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>),
+    <span class='doccomment'>/// An invalid counted repetition min/max was given. e.g., `a{2,1}`.</span>
+    <span class='ident'>InvalidRepeatRange</span> {
+        <span class='doccomment'>/// The first number specified in the repetition.</span>
+        <span class='ident'>min</span>: <span class='ident'>u32</span>,
+        <span class='doccomment'>/// The second number specified in the repetition.</span>
+        <span class='ident'>max</span>: <span class='ident'>u32</span>,
+    },
+    <span class='doccomment'>/// An invalid Unicode scalar value was used in a long hexadecimal</span>
+    <span class='doccomment'>/// sequence. e.g., `\x{D800}`.</span>
+    <span class='ident'>InvalidScalarValue</span>(<span class='ident'>u32</span>),
+    <span class='doccomment'>/// An empty counted repetition operator. e.g., `a{}`.</span>
+    <span class='ident'>MissingBase10</span>,
+    <span class='doccomment'>/// A repetition operator was not applied to an expression. e.g., `*`.</span>
+    <span class='ident'>RepeaterExpectsExpr</span>,
+    <span class='doccomment'>/// A repetition operator was applied to an expression that cannot be</span>
+    <span class='doccomment'>/// repeated. e.g., `a+*` or `a|*`.</span>
+    <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>),
+    <span class='doccomment'>/// A capture group name that is never closed. e.g., `(?P&lt;a`.</span>
+    <span class='ident'>UnclosedCaptureName</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// An unclosed hexadecimal literal. e.g., `\x{a`.</span>
+    <span class='ident'>UnclosedHex</span>,
+    <span class='doccomment'>/// An unclosed parenthesis. e.g., `(a`.</span>
+    <span class='ident'>UnclosedParen</span>,
+    <span class='doccomment'>/// An unclosed counted repetition operator. e.g., `a{2`.</span>
+    <span class='ident'>UnclosedRepeat</span>,
+    <span class='doccomment'>/// An unclosed named Unicode class. e.g., `\p{Yi`.</span>
+    <span class='ident'>UnclosedUnicodeName</span>,
+    <span class='doccomment'>/// Saw end of regex before class was closed. e.g., `[a`.</span>
+    <span class='ident'>UnexpectedClassEof</span>,
+    <span class='doccomment'>/// Saw end of regex before escape sequence was closed. e.g., `\`.</span>
+    <span class='ident'>UnexpectedEscapeEof</span>,
+    <span class='doccomment'>/// Saw end of regex before flags were closed. e.g., `(?i`.</span>
+    <span class='ident'>UnexpectedFlagEof</span>,
+    <span class='doccomment'>/// Saw end of regex before two hexadecimal digits were seen. e.g., `\xA`.</span>
+    <span class='ident'>UnexpectedTwoDigitHexEof</span>,
+    <span class='doccomment'>/// Unopened parenthesis. e.g., `)`.</span>
+    <span class='ident'>UnopenedParen</span>,
+    <span class='doccomment'>/// Unrecognized escape sequence. e.g., `\q`.</span>
+    <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>char</span>),
+    <span class='doccomment'>/// Unrecognized flag. e.g., `(?a)`.</span>
+    <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>char</span>),
+    <span class='doccomment'>/// Unrecognized named Unicode class. e.g., `\p{Foo}`.</span>
+    <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='ident'>String</span>),
+    <span class='doccomment'>/// Hints that destructuring should not be exhaustive.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This enum may grow additional variants, so this makes sure clients</span>
+    <span class='doccomment'>/// don&#39;t count on exhaustive matching. (Otherwise, adding a new variant</span>
+    <span class='doccomment'>/// could break existing code.)</span>
+    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+    <span class='ident'>__Nonexhaustive</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Error</span> {
+    <span class='doccomment'>/// Returns an approximate *character* offset at which the error occurred.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The character offset may be equal to the number of characters in the</span>
+    <span class='doccomment'>/// string, in which case it should be interpreted as pointing to the end</span>
+    <span class='doccomment'>/// of the regex.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>position</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='self'>self</span>.<span class='ident'>pos</span>
+    }
+
+    <span class='doccomment'>/// Returns the type of the regex parse error.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>kind</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>ErrorKind</span> {
+        <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>kind</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>ErrorKind</span> {
+    <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
+        <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>;
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>DoubleFlagNegation</span> <span class='op'>=&gt;</span> <span class='string'>&quot;double flag negation&quot;</span>,
+            <span class='ident'>DuplicateCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;duplicate capture name&quot;</span>,
+            <span class='ident'>EmptyAlternate</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty alternate&quot;</span>,
+            <span class='ident'>EmptyCaptureName</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty capture name&quot;</span>,
+            <span class='ident'>EmptyFlagNegation</span> <span class='op'>=&gt;</span> <span class='string'>&quot;flag negation without any flags&quot;</span>,
+            <span class='ident'>EmptyGroup</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty group (e.g., &#39;()&#39;)&quot;</span>,
+            <span class='ident'>InvalidBase10</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid base 10 number&quot;</span>,
+            <span class='ident'>InvalidBase16</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid base 16 number&quot;</span>,
+            <span class='ident'>InvalidCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid capture name&quot;</span>,
+            <span class='ident'>InvalidClassRange</span>{..} <span class='op'>=&gt;</span> <span class='string'>&quot;invalid character class range&quot;</span>,
+            <span class='ident'>InvalidClassEscape</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid escape sequence in class&quot;</span>,
+            <span class='ident'>InvalidRepeatRange</span>{..} <span class='op'>=&gt;</span> <span class='string'>&quot;invalid counted repetition range&quot;</span>,
+            <span class='ident'>InvalidScalarValue</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid Unicode scalar value&quot;</span>,
+            <span class='ident'>MissingBase10</span> <span class='op'>=&gt;</span> <span class='string'>&quot;missing count in repetition operator&quot;</span>,
+            <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=&gt;</span> <span class='string'>&quot;repetition operator missing expression&quot;</span>,
+            <span class='ident'>RepeaterUnexpectedExpr</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;expression cannot be repeated&quot;</span>,
+            <span class='ident'>UnclosedCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed capture group name&quot;</span>,
+            <span class='ident'>UnclosedHex</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed hexadecimal literal&quot;</span>,
+            <span class='ident'>UnclosedParen</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed parenthesis&quot;</span>,
+            <span class='ident'>UnclosedRepeat</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed counted repetition operator&quot;</span>,
+            <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed Unicode class literal&quot;</span>,
+            <span class='ident'>UnexpectedClassEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in character class&quot;</span>,
+            <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in escape sequence&quot;</span>,
+            <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in flags&quot;</span>,
+            <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in hex literal&quot;</span>,
+            <span class='ident'>UnopenedParen</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unopened parenthesis&quot;</span>,
+            <span class='ident'>UnrecognizedEscape</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized escape sequence&quot;</span>,
+            <span class='ident'>UnrecognizedFlag</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized flag&quot;</span>,
+            <span class='ident'>UnrecognizedUnicodeClass</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized Unicode class name&quot;</span>,
+            <span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+        }
+    }
+}
+
+<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
+    <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
+        <span class='self'>self</span>.<span class='ident'>kind</span>.<span class='ident'>description</span>()
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Error parsing regex near &#39;{}&#39; at character offset {}: {}&quot;</span>,
+               <span class='self'>self</span>.<span class='ident'>surround</span>, <span class='self'>self</span>.<span class='ident'>pos</span>, <span class='self'>self</span>.<span class='ident'>kind</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ErrorKind</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>;
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>DoubleFlagNegation</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Only one negation symbol is allowed in flags.&quot;</span>),
+            <span class='ident'>DuplicateCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture name &#39;{}&#39; is used more than once.&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>EmptyAlternate</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Alternations cannot be empty.&quot;</span>),
+            <span class='ident'>EmptyCaptureName</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture names cannot be empty.&quot;</span>),
+            <span class='ident'>EmptyFlagNegation</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Flag negation requires setting at least one flag.&quot;</span>),
+            <span class='ident'>EmptyGroup</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Empty regex groups (e.g., &#39;()&#39;) are not allowed.&quot;</span>),
+            <span class='ident'>InvalidBase10</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Not a valid base 10 number: &#39;{}&#39;&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>InvalidBase16</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Not a valid base 16 number: &#39;{}&#39;&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>InvalidCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid capture name: &#39;{}&#39;. Capture names must \
+                           consist of [_a-zA-Z0-9] and are not allowed to \
+                           start with with a number.&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>InvalidClassRange</span> { <span class='ident'>start</span>, <span class='ident'>end</span> } <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid character class range &#39;{}-{}&#39;. \
+                           Character class ranges must start with the smaller \
+                           character, but {} &gt; {}&quot;</span>, <span class='ident'>start</span>, <span class='ident'>end</span>, <span class='ident'>start</span>, <span class='ident'>end</span>),
+            <span class='ident'>InvalidClassEscape</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid escape sequence in character \
+                           class: &#39;{}&#39;.&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>InvalidRepeatRange</span> { <span class='ident'>min</span>, <span class='ident'>max</span> } <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid counted repetition range: {{{}, {}}}. \
+                           Counted repetition ranges must start with the \
+                           minimum, but {} &gt; {}&quot;</span>, <span class='ident'>min</span>, <span class='ident'>max</span>, <span class='ident'>min</span>, <span class='ident'>max</span>),
+            <span class='ident'>InvalidScalarValue</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Number does not correspond to a Unicode scalar \
+                           value: &#39;{}&#39;.&quot;</span>, <span class='ident'>c</span>),
+            <span class='ident'>MissingBase10</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Missing maximum in counted reptition operator.&quot;</span>),
+            <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Missing expression for reptition operator.&quot;</span>),
+            <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid application of reptition operator to: \
+                          &#39;{}&#39;.&quot;</span>, <span class='ident'>e</span>),
+            <span class='ident'>UnclosedCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture name group for &#39;{}&#39; is not closed. \
+                           (Missing a &#39;&gt;&#39;.)&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>UnclosedHex</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed hexadecimal literal (missing a &#39;}}&#39;).&quot;</span>),
+            <span class='ident'>UnclosedParen</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed parenthesis.&quot;</span>),
+            <span class='ident'>UnclosedRepeat</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed counted repetition (missing a &#39;}}&#39;).&quot;</span>),
+            <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed Unicode literal (missing a &#39;}}&#39;).&quot;</span>),
+            <span class='ident'>UnexpectedClassEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Character class was not closed before the end of \
+                           the regex (missing a &#39;]&#39;).&quot;</span>),
+            <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Started an escape sequence that didn&#39;t finish \
+                           before the end of the regex.&quot;</span>),
+            <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Inline flag settings was not closed before the end \
+                           of the regex (missing a &#39;)&#39; or &#39;:&#39;).&quot;</span>),
+            <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unexpected end of two digit hexadecimal literal.&quot;</span>),
+            <span class='ident'>UnopenedParen</span> <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unopened parenthesis.&quot;</span>),
+            <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized escape sequence: &#39;\\{}&#39;.&quot;</span>, <span class='ident'>c</span>),
+            <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized flag: &#39;{}&#39;. \
+                           (Allowed flags: i, s, m, U, x.)&quot;</span>, <span class='ident'>c</span>),
+            <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized Unicode class name: &#39;{}&#39;.&quot;</span>, <span class='ident'>s</span>),
+            <span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+        }
+    }
+}
+
+<span class='doccomment'>/// Returns the Unicode *simple* case folding of `c`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// N.B. This is hidden because it really isn&#39;t the responsibility of this</span>
+<span class='doccomment'>/// crate to do simple case folding. One hopes that either another crate or</span>
+<span class='doccomment'>/// the standard library will be able to do this for us. In any case, we still</span>
+<span class='doccomment'>/// expose it because it is used inside the various Regex engines.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+    <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>)
+        .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+        .<span class='ident'>unwrap_or</span>(<span class='ident'>c</span>)
+}
+
+<span class='doccomment'>/// The result of binary search on the simple case folding table.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This level of detail is exposed so that we can do case folding on a</span>
+<span class='doccomment'>/// range of characters efficiently.</span>
+<span class='kw'>fn</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span>, <span class='ident'>usize</span><span class='op'>&gt;</span> {
+    <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>x</span>, _)<span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>))
+}
+
+<span class='doccomment'>/// Escapes all regular expression meta characters in `text`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The string returned may be safely used as a literal in a regular</span>
+<span class='doccomment'>/// expression.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>quote</span>(<span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>quoted</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>text</span>.<span class='ident'>len</span>());
+    <span class='kw'>for</span> <span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>text</span>.<span class='ident'>chars</span>() {
+        <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+            <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>);
+        }
+        <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
+    }
+    <span class='ident'>quoted</span>
+}
+
+<span class='kw'>fn</span> <span class='ident'>quote_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>new</span>();
+    <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+        <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>);
+    }
+    <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
+    <span class='ident'>s</span>
+}
+
+<span class='kw'>fn</span> <span class='ident'>inc_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='ident'>char</span>::<span class='ident'>MAX</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>MAX</span>,
+        <span class='string'>&#39;\u{D7FF}&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\u{E000}&#39;</span>,
+        <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(),
+    }
+}
+
+<span class='kw'>fn</span> <span class='ident'>dec_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='string'>&#39;\x00&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\x00&#39;</span>,
+        <span class='string'>&#39;\u{E000}&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\u{D7FF}&#39;</span>,
+        <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>-</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(),
+    }
+}
+
+<span class='doccomment'>/// Returns true if and only if `c` is a word character.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_word_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='string'>&#39;_&#39;</span> <span class='op'>|</span> <span class='string'>&#39;0&#39;</span> ... <span class='string'>&#39;9&#39;</span> <span class='op'>|</span> <span class='string'>&#39;a&#39;</span> ... <span class='string'>&#39;z&#39;</span> <span class='op'>|</span> <span class='string'>&#39;A&#39;</span> ... <span class='string'>&#39;Z&#39;</span>  <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+        _ <span class='op'>=&gt;</span> ::<span class='ident'>unicode</span>::<span class='ident'>regex</span>::<span class='ident'>PERLW</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>start</span>, <span class='ident'>end</span>)<span class='op'>|</span> {
+            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='ident'>start</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='ident'>end</span> {
+                <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
+            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>&gt;</span> <span class='ident'>c</span> {
+                <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
+            } <span class='kw'>else</span> {
+                <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
+            }
+        }).<span class='ident'>is_ok</span>(),
+    }
+}
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>properties</span>;
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>tests</span> {
+    <span class='kw'>use</span> {<span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>};
+
+    <span class='kw'>fn</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>ranges</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>()
+                           .<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)).<span class='ident'>collect</span>();
+        <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>ranges</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>classi</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>);
+        <span class='ident'>cls</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+        <span class='ident'>cls</span>
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_no_change</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>cls</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_unordered</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;w&#39;</span>, <span class='string'>&#39;y&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;w&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;c&#39;</span>, <span class='string'>&#39;f&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;g&#39;</span>), (<span class='string'>&#39;d&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>),
+            (<span class='string'>&#39;m&#39;</span>, <span class='string'>&#39;p&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+        ]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many_case_fold</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;C&#39;</span>, <span class='string'>&#39;F&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;G&#39;</span>), (<span class='string'>&#39;D&#39;</span>, <span class='string'>&#39;J&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;C&#39;</span>),
+            (<span class='string'>&#39;M&#39;</span>, <span class='string'>&#39;P&#39;</span>), (<span class='string'>&#39;L&#39;</span>, <span class='string'>&#39;S&#39;</span>), (<span class='string'>&#39;c&#39;</span>, <span class='string'>&#39;f&#39;</span>),
+        ]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_boundary</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;u&#39;</span>, <span class='string'>&#39;w&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;u&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_extreme_edge_case</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>), (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_canon_singles</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>), (<span class='string'>&#39;b&#39;</span>, <span class='string'>&#39;b&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;b&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_single</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_singles</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>), (<span class='string'>&#39;b&#39;</span>, <span class='string'>&#39;b&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x63&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_multiples</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x64&#39;</span>, <span class='string'>&#39;\x77&#39;</span>), (<span class='string'>&#39;\x7b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_min_scalar</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;a&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_max_scalar</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_everything</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_everything_sans_one</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFD}&#39;</span>), (<span class='string'>&#39;\u{10FFFF}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)
+        ]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{10FFFE}&#39;</span>, <span class='string'>&#39;\u{10FFFE}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{E000}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min_edge</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FE}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{D7FF}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\u{E000}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FF}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max_edge</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\u{E001}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{E000}&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_retain_only_needed</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_az</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_a_underscore</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>),
+        ]));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_a_equals</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>),
+        ]));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_fold_no_folding_needed</span>() {
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x10&#39;</span>)]);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x10&#39;</span>),
+        ]));
+    }
+}
+</pre>
+</section>
+    <section id='search' class="content hidden"></section>
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+\ No newline at end of file
diff --git a/src/regex_syntax/parser.rs.html b/src/regex_syntax/parser.rs.html
new file mode 100644
index 0000000..3f94959
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+<html lang="en">
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">   1</span>
+<span id="2">   2</span>
+<span id="3">   3</span>
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+<span id="2018">2018</span>
+<span id="2019">2019</span>
+<span id="2020">2020</span>
+<span id="2021">2021</span>
+<span id="2022">2022</span>
+<span id="2023">2023</span>
+<span id="2024">2024</span>
+<span id="2025">2025</span>
+<span id="2026">2026</span>
+<span id="2027">2027</span>
+<span id="2028">2028</span>
+<span id="2029">2029</span>
+<span id="2030">2030</span>
+<span id="2031">2031</span>
+<span id="2032">2032</span>
+<span id="2033">2033</span>
+<span id="2034">2034</span>
+<span id="2035">2035</span>
+<span id="2036">2036</span>
+<span id="2037">2037</span>
+<span id="2038">2038</span>
+<span id="2039">2039</span>
+<span id="2040">2040</span>
+<span id="2041">2041</span>
+<span id="2042">2042</span>
+<span id="2043">2043</span>
+<span id="2044">2044</span>
+<span id="2045">2045</span>
+<span id="2046">2046</span>
+<span id="2047">2047</span>
+<span id="2048">2048</span>
+<span id="2049">2049</span>
+<span id="2050">2050</span>
+<span id="2051">2051</span>
+<span id="2052">2052</span>
+<span id="2053">2053</span>
+<span id="2054">2054</span>
+<span id="2055">2055</span>
+<span id="2056">2056</span>
+<span id="2057">2057</span>
+<span id="2058">2058</span>
+<span id="2059">2059</span>
+<span id="2060">2060</span>
+<span id="2061">2061</span>
+<span id="2062">2062</span>
+<span id="2063">2063</span>
+<span id="2064">2064</span>
+<span id="2065">2065</span>
+<span id="2066">2066</span>
+<span id="2067">2067</span>
+<span id="2068">2068</span>
+<span id="2069">2069</span>
+<span id="2070">2070</span>
+<span id="2071">2071</span>
+<span id="2072">2072</span>
+<span id="2073">2073</span>
+<span id="2074">2074</span>
+<span id="2075">2075</span>
+<span id="2076">2076</span>
+<span id="2077">2077</span>
+<span id="2078">2078</span>
+<span id="2079">2079</span>
+<span id="2080">2080</span>
+<span id="2081">2081</span>
+<span id="2082">2082</span>
+<span id="2083">2083</span>
+<span id="2084">2084</span>
+<span id="2085">2085</span>
+<span id="2086">2086</span>
+<span id="2087">2087</span>
+<span id="2088">2088</span>
+<span id="2089">2089</span>
+<span id="2090">2090</span>
+<span id="2091">2091</span>
+<span id="2092">2092</span>
+<span id="2093">2093</span>
+<span id="2094">2094</span>
+<span id="2095">2095</span>
+<span id="2096">2096</span>
+<span id="2097">2097</span>
+<span id="2098">2098</span>
+<span id="2099">2099</span>
+<span id="2100">2100</span>
+<span id="2101">2101</span>
+<span id="2102">2102</span>
+<span id="2103">2103</span>
+<span id="2104">2104</span>
+<span id="2105">2105</span>
+<span id="2106">2106</span>
+<span id="2107">2107</span>
+<span id="2108">2108</span>
+<span id="2109">2109</span>
+<span id="2110">2110</span>
+<span id="2111">2111</span>
+<span id="2112">2112</span>
+<span id="2113">2113</span>
+<span id="2114">2114</span>
+<span id="2115">2115</span>
+<span id="2116">2116</span>
+<span id="2117">2117</span>
+<span id="2118">2118</span>
+<span id="2119">2119</span>
+<span id="2120">2120</span>
+<span id="2121">2121</span>
+<span id="2122">2122</span>
+<span id="2123">2123</span>
+<span id="2124">2124</span>
+<span id="2125">2125</span>
+<span id="2126">2126</span>
+<span id="2127">2127</span>
+<span id="2128">2128</span>
+<span id="2129">2129</span>
+<span id="2130">2130</span>
+<span id="2131">2131</span>
+<span id="2132">2132</span>
+<span id="2133">2133</span>
+<span id="2134">2134</span>
+<span id="2135">2135</span>
+<span id="2136">2136</span>
+<span id="2137">2137</span>
+<span id="2138">2138</span>
+<span id="2139">2139</span>
+<span id="2140">2140</span>
+<span id="2141">2141</span>
+<span id="2142">2142</span>
+<span id="2143">2143</span>
+<span id="2144">2144</span>
+<span id="2145">2145</span>
+<span id="2146">2146</span>
+<span id="2147">2147</span>
+<span id="2148">2148</span>
+<span id="2149">2149</span>
+<span id="2150">2150</span>
+<span id="2151">2151</span>
+<span id="2152">2152</span>
+<span id="2153">2153</span>
+<span id="2154">2154</span>
+<span id="2155">2155</span>
+<span id="2156">2156</span>
+<span id="2157">2157</span>
+<span id="2158">2158</span>
+<span id="2159">2159</span>
+<span id="2160">2160</span>
+<span id="2161">2161</span>
+<span id="2162">2162</span>
+<span id="2163">2163</span>
+<span id="2164">2164</span>
+<span id="2165">2165</span>
+<span id="2166">2166</span>
+<span id="2167">2167</span>
+<span id="2168">2168</span>
+<span id="2169">2169</span>
+<span id="2170">2170</span>
+<span id="2171">2171</span>
+<span id="2172">2172</span>
+<span id="2173">2173</span>
+<span id="2174">2174</span>
+<span id="2175">2175</span>
+<span id="2176">2176</span>
+<span id="2177">2177</span>
+<span id="2178">2178</span>
+<span id="2179">2179</span>
+<span id="2180">2180</span>
+<span id="2181">2181</span>
+<span id="2182">2182</span>
+<span id="2183">2183</span>
+<span id="2184">2184</span>
+<span id="2185">2185</span>
+<span id="2186">2186</span>
+<span id="2187">2187</span>
+<span id="2188">2188</span>
+<span id="2189">2189</span>
+<span id="2190">2190</span>
+<span id="2191">2191</span>
+<span id="2192">2192</span>
+<span id="2193">2193</span>
+<span id="2194">2194</span>
+<span id="2195">2195</span>
+<span id="2196">2196</span>
+<span id="2197">2197</span>
+<span id="2198">2198</span>
+<span id="2199">2199</span>
+<span id="2200">2200</span>
+<span id="2201">2201</span>
+<span id="2202">2202</span>
+<span id="2203">2203</span>
+<span id="2204">2204</span>
+<span id="2205">2205</span>
+<span id="2206">2206</span>
+<span id="2207">2207</span>
+<span id="2208">2208</span>
+<span id="2209">2209</span>
+<span id="2210">2210</span>
+<span id="2211">2211</span>
+<span id="2212">2212</span>
+<span id="2213">2213</span>
+<span id="2214">2214</span>
+<span id="2215">2215</span>
+<span id="2216">2216</span>
+<span id="2217">2217</span>
+<span id="2218">2218</span>
+<span id="2219">2219</span>
+<span id="2220">2220</span>
+<span id="2221">2221</span>
+<span id="2222">2222</span>
+<span id="2223">2223</span>
+<span id="2224">2224</span>
+<span id="2225">2225</span>
+<span id="2226">2226</span>
+<span id="2227">2227</span>
+<span id="2228">2228</span>
+<span id="2229">2229</span>
+<span id="2230">2230</span>
+<span id="2231">2231</span>
+<span id="2232">2232</span>
+<span id="2233">2233</span>
+<span id="2234">2234</span>
+<span id="2235">2235</span>
+<span id="2236">2236</span>
+<span id="2237">2237</span>
+<span id="2238">2238</span>
+<span id="2239">2239</span>
+<span id="2240">2240</span>
+<span id="2241">2241</span>
+<span id="2242">2242</span>
+<span id="2243">2243</span>
+<span id="2244">2244</span>
+<span id="2245">2245</span>
+<span id="2246">2246</span>
+<span id="2247">2247</span>
+<span id="2248">2248</span>
+<span id="2249">2249</span>
+<span id="2250">2250</span>
+<span id="2251">2251</span>
+<span id="2252">2252</span>
+<span id="2253">2253</span>
+<span id="2254">2254</span>
+<span id="2255">2255</span>
+<span id="2256">2256</span>
+<span id="2257">2257</span>
+<span id="2258">2258</span>
+<span id="2259">2259</span>
+<span id="2260">2260</span>
+<span id="2261">2261</span>
+<span id="2262">2262</span>
+<span id="2263">2263</span>
+<span id="2264">2264</span>
+<span id="2265">2265</span>
+<span id="2266">2266</span>
+<span id="2267">2267</span>
+<span id="2268">2268</span>
+<span id="2269">2269</span>
+<span id="2270">2270</span>
+<span id="2271">2271</span>
+<span id="2272">2272</span>
+<span id="2273">2273</span>
+<span id="2274">2274</span>
+<span id="2275">2275</span>
+<span id="2276">2276</span>
+<span id="2277">2277</span>
+<span id="2278">2278</span>
+<span id="2279">2279</span>
+<span id="2280">2280</span>
+<span id="2281">2281</span>
+<span id="2282">2282</span>
+<span id="2283">2283</span>
+<span id="2284">2284</span>
+<span id="2285">2285</span>
+<span id="2286">2286</span>
+<span id="2287">2287</span>
+<span id="2288">2288</span>
+<span id="2289">2289</span>
+<span id="2290">2290</span>
+<span id="2291">2291</span>
+<span id="2292">2292</span>
+<span id="2293">2293</span>
+<span id="2294">2294</span>
+<span id="2295">2295</span>
+<span id="2296">2296</span>
+<span id="2297">2297</span>
+<span id="2298">2298</span>
+<span id="2299">2299</span>
+<span id="2300">2300</span>
+<span id="2301">2301</span>
+<span id="2302">2302</span>
+<span id="2303">2303</span>
+<span id="2304">2304</span>
+<span id="2305">2305</span>
+<span id="2306">2306</span>
+<span id="2307">2307</span>
+<span id="2308">2308</span>
+<span id="2309">2309</span>
+<span id="2310">2310</span>
+<span id="2311">2311</span>
+<span id="2312">2312</span>
+<span id="2313">2313</span>
+<span id="2314">2314</span>
+<span id="2315">2315</span>
+<span id="2316">2316</span>
+<span id="2317">2317</span>
+<span id="2318">2318</span>
+<span id="2319">2319</span>
+<span id="2320">2320</span>
+<span id="2321">2321</span>
+<span id="2322">2322</span>
+<span id="2323">2323</span>
+<span id="2324">2324</span>
+<span id="2325">2325</span>
+<span id="2326">2326</span>
+<span id="2327">2327</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
+<span class='comment'>// file at the top-level directory of this distribution and at</span>
+<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
+<span class='comment'>//</span>
+<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
+<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
+<span class='comment'>// except according to those terms.</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::{<span class='ident'>max</span>, <span class='ident'>min</span>};
+
+<span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>regex</span>::<span class='ident'>UNICODE_CLASSES</span>;
+
+<span class='kw'>use</span> {
+    <span class='ident'>Expr</span>, <span class='ident'>Repeater</span>, <span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>, <span class='ident'>CaptureIndex</span>, <span class='ident'>CaptureName</span>,
+    <span class='ident'>Error</span>, <span class='ident'>ErrorKind</span>, <span class='prelude-ty'>Result</span>,
+};
+
+<span class='doccomment'>/// Parser state.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Keeps the entire input in memory and maintains a cursor (char offset).</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// It also keeps an expression stack, which is responsible for managing</span>
+<span class='doccomment'>/// grouped expressions and flag state.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Parser</span> {
+    <span class='ident'>chars</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span>,
+    <span class='ident'>chari</span>: <span class='ident'>usize</span>,
+    <span class='ident'>stack</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span>,
+    <span class='ident'>caps</span>: <span class='ident'>usize</span>,
+    <span class='ident'>names</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>, <span class='comment'>// to check for duplicates</span>
+    <span class='ident'>flags</span>: <span class='ident'>Flags</span>,
+}
+
+<span class='doccomment'>/// An empheral type for representing the expression stack.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Everything on the stack is either a regular expression or a marker</span>
+<span class='doccomment'>/// indicating the opening of a group (possibly non-capturing). The opening</span>
+<span class='doccomment'>/// of a group copies the current flag state, which is reset on the parser</span>
+<span class='doccomment'>/// state once the group closes.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
+<span class='kw'>enum</span> <span class='ident'>Build</span> {
+    <span class='ident'>Expr</span>(<span class='ident'>Expr</span>),
+    <span class='ident'>LeftParen</span> {
+        <span class='ident'>i</span>: <span class='ident'>CaptureIndex</span>,
+        <span class='ident'>name</span>: <span class='ident'>CaptureName</span>,
+        <span class='ident'>chari</span>: <span class='ident'>usize</span>,
+        <span class='ident'>old_flags</span>: <span class='ident'>Flags</span>,
+    },
+}
+
+<span class='doccomment'>/// Flag state.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
+<span class='kw'>struct</span> <span class='ident'>Flags</span> {
+    <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+    <span class='ident'>multi</span>: <span class='ident'>bool</span>,
+    <span class='ident'>dotnl</span>: <span class='ident'>bool</span>,
+    <span class='ident'>swap_greed</span>: <span class='ident'>bool</span>,
+    <span class='ident'>ignore_space</span>: <span class='ident'>bool</span>,
+}
+
+<span class='comment'>// Primary expression parsing routines.</span>
+<span class='kw'>impl</span> <span class='ident'>Parser</span> {
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='ident'>Parser</span> {
+            <span class='ident'>chars</span>: <span class='ident'>s</span>.<span class='ident'>chars</span>().<span class='ident'>collect</span>(),
+            <span class='ident'>chari</span>: <span class='number'>0</span>,
+            <span class='ident'>stack</span>: <span class='macro'>vec</span><span class='macro'>!</span>[],
+            <span class='ident'>caps</span>: <span class='number'>0</span>,
+            <span class='ident'>names</span>: <span class='macro'>vec</span><span class='macro'>!</span>[],
+            <span class='ident'>flags</span>: <span class='ident'>Flags</span> {
+                <span class='ident'>casei</span>: <span class='boolval'>false</span>,
+                <span class='ident'>multi</span>: <span class='boolval'>false</span>,
+                <span class='ident'>dotnl</span>: <span class='boolval'>false</span>,
+                <span class='ident'>swap_greed</span>: <span class='boolval'>false</span>,
+                <span class='ident'>ignore_space</span>: <span class='boolval'>false</span>,
+            },
+        }.<span class='ident'>parse_expr</span>()
+    }
+
+    <span class='comment'>// Top-level expression parser.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Starts at the beginning of the input and consumes until either the end</span>
+    <span class='comment'>// of input or an error.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_expr</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='kw'>while</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='kw'>let</span> <span class='ident'>build_expr</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+                <span class='string'>&#39;\\&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_escape</span>()),
+                <span class='string'>&#39;|&#39;</span> <span class='op'>=&gt;</span> { <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>alternate</span>()); <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='ident'>e</span> }
+                <span class='string'>&#39;?&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_simple_repeat</span>(<span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>)),
+                <span class='string'>&#39;*&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_simple_repeat</span>(<span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>)),
+                <span class='string'>&#39;+&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_simple_repeat</span>(<span class='ident'>Repeater</span>::<span class='ident'>OneOrMore</span>)),
+                <span class='string'>&#39;{&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_counted_repeat</span>()),
+                <span class='string'>&#39;[&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>maybe_parse_ascii</span>() {
+                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class</span>()),
+                    <span class='prelude-val'>Some</span>(<span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>)),
+                },
+                <span class='string'>&#39;^&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>multi</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>StartLine</span>)
+                    } <span class='kw'>else</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>)
+                    }
+                }
+                <span class='string'>&#39;$&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>multi</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>EndLine</span>)
+                    } <span class='kw'>else</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>EndText</span>)
+                    }
+                }
+                <span class='string'>&#39;.&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>dotnl</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>AnyChar</span>)
+                    } <span class='kw'>else</span> {
+                        <span class='self'>self</span>.<span class='ident'>parse_one</span>(<span class='ident'>Expr</span>::<span class='ident'>AnyCharNoNL</span>)
+                    }
+                }
+                <span class='string'>&#39;(&#39;</span> <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_group</span>()),
+                <span class='string'>&#39;)&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>let</span> (<span class='ident'>old_flags</span>, <span class='ident'>e</span>) <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>close_paren</span>());
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='self'>self</span>.<span class='ident'>flags</span> <span class='op'>=</span> <span class='ident'>old_flags</span>;
+                    <span class='ident'>e</span>
+                }
+                _ <span class='op'>=&gt;</span> <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+                    <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='self'>self</span>.<span class='ident'>bump</span>()],
+                    <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+                }),
+            };
+            <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>build_expr</span>.<span class='ident'>is_empty</span>() {
+                <span class='kw'>let</span> <span class='ident'>build_expr</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>maybe_class_case_fold</span>(<span class='ident'>build_expr</span>);
+                <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>push</span>(<span class='ident'>build_expr</span>);
+            }
+        }
+        <span class='self'>self</span>.<span class='ident'>finish_concat</span>()
+    }
+
+    <span class='comment'>// Parses an escape sequence, e.g., \Ax</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `\`</span>
+    <span class='comment'>// End:   `x`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_escape</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>));
+        }
+        <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cur</span>();
+        <span class='kw'>if</span> <span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+                <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='self'>self</span>.<span class='ident'>bump</span>()],
+                <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+            }));
+        }
+
+        <span class='kw'>fn</span> <span class='ident'>lit</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>Build</span> {
+            <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>], <span class='ident'>casei</span>: <span class='boolval'>false</span> })
+        }
+        <span class='kw'>match</span> <span class='ident'>c</span> {
+            <span class='string'>&#39;a&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\x07&#39;</span>)) }
+            <span class='string'>&#39;f&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\x0C&#39;</span>)) }
+            <span class='string'>&#39;t&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\t&#39;</span>)) }
+            <span class='string'>&#39;n&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\n&#39;</span>)) }
+            <span class='string'>&#39;r&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\r&#39;</span>)) }
+            <span class='string'>&#39;v&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>lit</span>(<span class='string'>&#39;\x0B&#39;</span>)) }
+            <span class='string'>&#39;A&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>)) }
+            <span class='string'>&#39;z&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>EndText</span>)) }
+            <span class='string'>&#39;b&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>WordBoundary</span>)) }
+            <span class='string'>&#39;B&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>NotWordBoundary</span>)) }
+            <span class='string'>&#39;0&#39;</span><span class='op'>|</span><span class='string'>&#39;1&#39;</span><span class='op'>|</span><span class='string'>&#39;2&#39;</span><span class='op'>|</span><span class='string'>&#39;3&#39;</span><span class='op'>|</span><span class='string'>&#39;4&#39;</span><span class='op'>|</span><span class='string'>&#39;5&#39;</span><span class='op'>|</span><span class='string'>&#39;6&#39;</span><span class='op'>|</span><span class='string'>&#39;7&#39;</span> <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>parse_octal</span>(),
+            <span class='string'>&#39;x&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='self'>self</span>.<span class='ident'>parse_hex</span>() }
+            <span class='string'>&#39;p&#39;</span><span class='op'>|</span><span class='string'>&#39;P&#39;</span> <span class='op'>=&gt;</span> {
+                <span class='self'>self</span>.<span class='ident'>bump</span>();
+                <span class='self'>self</span>.<span class='ident'>parse_unicode_class</span>(<span class='ident'>c</span> <span class='op'>==</span> <span class='string'>&#39;P&#39;</span>)
+                    .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>cls</span><span class='op'>|</span> <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>)))
+            }
+            <span class='string'>&#39;d&#39;</span><span class='op'>|</span><span class='string'>&#39;s&#39;</span><span class='op'>|</span><span class='string'>&#39;w&#39;</span><span class='op'>|</span><span class='string'>&#39;D&#39;</span><span class='op'>|</span><span class='string'>&#39;S&#39;</span><span class='op'>|</span><span class='string'>&#39;W&#39;</span> <span class='op'>=&gt;</span> {
+                <span class='self'>self</span>.<span class='ident'>bump</span>();
+                <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='self'>self</span>.<span class='ident'>parse_perl_class</span>(<span class='ident'>c</span>))))
+            }
+            <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedEscape</span>(<span class='ident'>c</span>))),
+        }
+    }
+
+    <span class='comment'>// Parses a group, e.g., `(abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `(`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// A more interesting example, `(?P&lt;foo&gt;abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `(`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_group</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>chari</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chari</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>name</span>: <span class='ident'>CaptureName</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&quot;?P&lt;&quot;</span>) {
+            <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_group_name</span>());
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>names</span>.<span class='ident'>iter</span>().<span class='ident'>any</span>(<span class='op'>|</span><span class='ident'>n2</span><span class='op'>|</span> <span class='ident'>n2</span> <span class='op'>==</span> <span class='kw-2'>&amp;</span><span class='ident'>n</span>) {
+                <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>DuplicateCaptureName</span>(<span class='ident'>n</span>)));
+            }
+            <span class='self'>self</span>.<span class='ident'>names</span>.<span class='ident'>push</span>(<span class='ident'>n</span>.<span class='ident'>clone</span>());
+            <span class='ident'>name</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>n</span>);
+        } <span class='kw'>else</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&quot;?&quot;</span>) {
+            <span class='comment'>// This can never be capturing. It&#39;s either setting flags for</span>
+            <span class='comment'>// the current group, or it&#39;s opening a non-capturing group or</span>
+            <span class='comment'>// it&#39;s opening a group with a specific set of flags (which is</span>
+            <span class='comment'>// also non-capturing).</span>
+            <span class='comment'>// Anything else is an error.</span>
+            <span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>parse_group_flags</span>(<span class='ident'>chari</span>);
+        }
+        <span class='self'>self</span>.<span class='ident'>caps</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>caps</span>, <span class='number'>1</span>);
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> {
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>caps</span>),
+            <span class='ident'>name</span>: <span class='ident'>name</span>,
+            <span class='ident'>chari</span>: <span class='ident'>chari</span>,
+            <span class='ident'>old_flags</span>: <span class='self'>self</span>.<span class='ident'>flags</span>, <span class='comment'>// no flags changed if we&#39;re here</span>
+        })
+    }
+
+    <span class='comment'>// Parses flags (inline or grouped), e.g., `(?s-i:abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `s`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Another example, `(?s-i)a`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `s`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_group_flags</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>opening_chari</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>old_flags</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>flags</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>sign</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+        <span class='kw'>loop</span> {
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+                <span class='comment'>// e.g., (?i</span>
+                <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedFlagEof</span>));
+            }
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+                <span class='string'>&#39;i&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;m&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>multi</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;s&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>dotnl</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;U&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>swap_greed</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;x&#39;</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>ignore_space</span> <span class='op'>=</span> <span class='ident'>sign</span>; <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>true</span> }
+                <span class='string'>&#39;-&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>sign</span> {
+                        <span class='comment'>// e.g., (?-i-s)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>DoubleFlagNegation</span>));
+                    }
+                    <span class='ident'>sign</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+                    <span class='ident'>saw_flag</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+                }
+                <span class='string'>&#39;)&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>saw_flag</span> {
+                        <span class='comment'>// e.g., (?)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>));
+                    }
+                    <span class='comment'>// At this point, we&#39;re just changing the flags inside</span>
+                    <span class='comment'>// the current group, which means the old flags have</span>
+                    <span class='comment'>// been saved elsewhere. Our modifications in place are</span>
+                    <span class='comment'>// okey dokey!</span>
+                    <span class='comment'>//</span>
+                    <span class='comment'>// This particular flag expression only has a stateful</span>
+                    <span class='comment'>// impact on a regex&#39;s AST, so nothing gets explicitly</span>
+                    <span class='comment'>// added.</span>
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Empty</span>));
+                }
+                <span class='string'>&#39;:&#39;</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>sign</span> <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='ident'>saw_flag</span> {
+                        <span class='comment'>// e.g., (?i-:a)</span>
+                        <span class='comment'>// Note that if there&#39;s no negation, it&#39;s OK not</span>
+                        <span class='comment'>// to see flag, because you end up with a regular</span>
+                        <span class='comment'>// non-capturing group: `(?:a)`.</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>));
+                    }
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> {
+                        <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                        <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+                        <span class='ident'>chari</span>: <span class='ident'>opening_chari</span>,
+                        <span class='ident'>old_flags</span>: <span class='ident'>old_flags</span>,
+                    });
+                }
+                <span class='comment'>// e.g., (?z:a)</span>
+                <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedFlag</span>(<span class='ident'>c</span>))),
+            }
+            <span class='self'>self</span>.<span class='ident'>bump</span>();
+        }
+    }
+
+    <span class='comment'>// Parses a group name, e.g., `foo` in `(?P&lt;foo&gt;abc)`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `f`</span>
+    <span class='comment'>// End:   `a`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_group_name</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>name</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>new</span>();
+        <span class='kw'>while</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>eof</span>() <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>peek_is</span>(<span class='string'>&#39;&gt;&#39;</span>) {
+            <span class='ident'>name</span>.<span class='ident'>push</span>(<span class='self'>self</span>.<span class='ident'>bump</span>());
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='comment'>// e.g., (?P&lt;a</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedCaptureName</span>(<span class='ident'>name</span>)));
+        }
+        <span class='kw'>let</span> <span class='ident'>all_valid</span> <span class='op'>=</span> <span class='ident'>name</span>.<span class='ident'>chars</span>().<span class='ident'>all</span>(<span class='ident'>is_valid_capture_char</span>);
+        <span class='kw'>match</span> <span class='ident'>name</span>.<span class='ident'>chars</span>().<span class='ident'>next</span>() {
+            <span class='comment'>// e.g., (?P&lt;&gt;a)</span>
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyCaptureName</span>)),
+            <span class='prelude-val'>Some</span>(<span class='ident'>c</span>) <span class='kw'>if</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;9&#39;</span>) <span class='op'>||</span> <span class='op'>!</span><span class='ident'>all_valid</span> <span class='op'>=&gt;</span> {
+                <span class='comment'>// e.g., (?P&lt;a#&gt;x)</span>
+                <span class='comment'>// e.g., (?P&lt;1a&gt;x)</span>
+                <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidCaptureName</span>(<span class='ident'>name</span>)))
+            }
+            _ <span class='op'>=&gt;</span> {
+                <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='comment'>// for `&gt;`</span>
+                <span class='prelude-val'>Ok</span>(<span class='ident'>name</span>)
+            }
+        }
+    }
+
+    <span class='comment'>// Parses a counted repeition operator, e.g., `a{2,4}?z`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `{`</span>
+    <span class='comment'>// End:   `z`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_counted_repeat</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>pop</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>)); <span class='comment'>// e.g., ({5}</span>
+        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+            <span class='comment'>// e.g., a*{5}</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>e</span>)));
+        }
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>let</span> <span class='ident'>min</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_decimal</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;,&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>));
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>max_opt</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>min</span>);
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;,&#39;</span>) {
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>peek_is</span>(<span class='string'>&#39;}&#39;</span>) {
+                <span class='ident'>max_opt</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
+            } <span class='kw'>else</span> {
+                <span class='kw'>let</span> <span class='ident'>max</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_decimal</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>));
+                <span class='kw'>if</span> <span class='ident'>min</span> <span class='op'>&gt;</span> <span class='ident'>max</span> {
+                    <span class='comment'>// e.g., a{2,1}</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidRepeatRange</span> {
+                        <span class='ident'>min</span>: <span class='ident'>min</span>,
+                        <span class='ident'>max</span>: <span class='ident'>max</span>,
+                    }));
+                }
+                <span class='ident'>max_opt</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>max</span>);
+            }
+        }
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;}&#39;</span>) {
+            <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedRepeat</span>))
+        } <span class='kw'>else</span> {
+            <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>min</span>, <span class='ident'>max</span>: <span class='ident'>max_opt</span> },
+                <span class='ident'>greedy</span>: <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;?&#39;</span>) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>swap_greed</span>,
+            }))
+        }
+    }
+
+    <span class='comment'>// Parses a simple repetition operator, e.g., `a+?z`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `+`</span>
+    <span class='comment'>// End:   `z`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// N.B. &quot;simple&quot; in this context means &quot;not min/max repetition&quot;,</span>
+    <span class='comment'>// e.g., `a{1,2}`.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_simple_repeat</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>rep</span>: <span class='ident'>Repeater</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>pop</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>)); <span class='comment'>// e.g., (*</span>
+        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+            <span class='comment'>// e.g., a**</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>e</span>)));
+        }
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>),
+            <span class='ident'>r</span>: <span class='ident'>rep</span>,
+            <span class='ident'>greedy</span>: <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;?&#39;</span>) <span class='op'>^</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>swap_greed</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a decimal number until the given character, e.g., `a{123,456}`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `1`</span>
+    <span class='comment'>// End:   `,` (where `until == &#39;,&#39;`)</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_decimal</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>until</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> {
+        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='ident'>until</span>) {
+            <span class='comment'>// e.g., a{}</span>
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>MissingBase10</span>)),
+            <span class='prelude-val'>Some</span>(<span class='ident'>n</span>) <span class='op'>=&gt;</span> {
+                <span class='comment'>// e.g., a{xyz</span>
+                <span class='comment'>// e.g., a{9999999999}</span>
+                <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>n</span>.<span class='ident'>trim</span>();
+                <span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='ident'>n</span>, <span class='number'>10</span>)
+                    .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='ident'>n</span>.<span class='ident'>into</span>())))
+            }
+        }
+    }
+
+    <span class='comment'>// Parses an octal number, up to 3 digits, e.g., `a\123b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `1`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_octal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>; <span class='comment'>// counter for limiting octal to 3 digits.</span>
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> { <span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>; <span class='ident'>i</span> <span class='op'>&lt;=</span> <span class='number'>3</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;7&#39;</span> })
+                    .<span class='ident'>expect</span>(<span class='string'>&quot;octal string&quot;</span>); <span class='comment'>// guaranteed at least 1 digit</span>
+        <span class='comment'>// I think both of the following unwraps are impossible to fail.</span>
+        <span class='comment'>// We limit it to a three digit octal number, which maxes out at</span>
+        <span class='comment'>// `0777` or `511` in decimal. Since all digits are in `0...7`, we&#39;ll</span>
+        <span class='comment'>// always have a valid `u32` number. Moreover, since all numbers in</span>
+        <span class='comment'>// the range `0...511` are valid Unicode scalar values, it will always</span>
+        <span class='comment'>// be a valid `char`.</span>
+        <span class='comment'>//</span>
+        <span class='comment'>// Hence, we `unwrap` with reckless abandon.</span>
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='kw-2'>&amp;</span><span class='ident'>n</span>, <span class='number'>8</span>).<span class='ident'>ok</span>().<span class='ident'>expect</span>(<span class='string'>&quot;valid octal number&quot;</span>);
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+            <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>n</span>).<span class='ident'>expect</span>(<span class='string'>&quot;Unicode scalar value&quot;</span>)],
+            <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a hex number, e.g., `a\x5ab`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `5`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// And also, `a\x{2603}b`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `{`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_hex</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;{&#39;</span>) {
+            <span class='self'>self</span>.<span class='ident'>parse_hex_many_digits</span>()
+        } <span class='kw'>else</span> {
+            <span class='self'>self</span>.<span class='ident'>parse_hex_two_digits</span>()
+        }
+    }
+
+    <span class='comment'>// Parses a many-digit hex number, e.g., `a\x{2603}b`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `2`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_hex_many_digits</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+
+        <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>());
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='kw-2'>&amp;</span><span class='ident'>s</span>, <span class='number'>16</span>)
+                         .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='ident'>s</span>))));
+        <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>n</span>)
+                          .<span class='ident'>ok_or</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidScalarValue</span>(<span class='ident'>n</span>))));
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;}&#39;</span>) {
+            <span class='comment'>// e.g., a\x{d</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedHex</span>));
+        }
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+            <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>],
+            <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a two-digit hex number, e.g., `a\x5ab`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `5`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_hex_two_digits</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>;
+        <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span>_<span class='op'>|</span> { <span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>; <span class='ident'>i</span> <span class='op'>&lt;=</span> <span class='number'>2</span> }).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>());
+        <span class='kw'>if</span> <span class='ident'>s</span>.<span class='ident'>len</span>() <span class='op'>&lt;</span> <span class='number'>2</span> {
+            <span class='comment'>// e.g., a\x</span>
+            <span class='comment'>// e.g., a\xf</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedTwoDigitHexEof</span>));
+        }
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>u32</span>::<span class='ident'>from_str_radix</span>(<span class='kw-2'>&amp;</span><span class='ident'>s</span>, <span class='number'>16</span>)
+                         .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='ident'>s</span>))));
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> {
+            <span class='comment'>// Because 0...255 are all valid Unicode scalar values.</span>
+            <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>n</span>).<span class='ident'>expect</span>(<span class='string'>&quot;Unicode scalar value&quot;</span>)],
+            <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span>,
+        }))
+    }
+
+    <span class='comment'>// Parses a character class, e.g., `[^a-zA-Z0-9]+`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `[`</span>
+    <span class='comment'>// End:   `+`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_class</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='kw'>let</span> <span class='ident'>negated</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;^&#39;</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>class</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>();
+        <span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;-&#39;</span>) {
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='string'>&#39;-&#39;</span>));
+        }
+        <span class='kw'>loop</span> {
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+                <span class='comment'>// e.g., [a</span>
+                <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>));
+            }
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+                <span class='comment'>// If no ranges have been added, then `]` is the first</span>
+                <span class='comment'>// character (sans, perhaps, the `^` symbol), so it should</span>
+                <span class='comment'>// be interpreted as a `]` instead of a closing class bracket.</span>
+                <span class='string'>&#39;]&#39;</span> <span class='kw'>if</span> <span class='ident'>class</span>.<span class='ident'>len</span>() <span class='op'>&gt;</span> <span class='number'>0</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>bump</span>(); <span class='kw'>break</span> }
+                <span class='string'>&#39;[&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>maybe_parse_ascii</span>() {
+                    <span class='prelude-val'>Some</span>(<span class='ident'>class2</span>) <span class='op'>=&gt;</span> <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>class2</span>),
+                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
+                        <span class='self'>self</span>.<span class='ident'>bump</span>();
+                        <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>class</span>, <span class='string'>&#39;[&#39;</span>))
+                    }
+                },
+                <span class='string'>&#39;\\&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_escape</span>()) {
+                    <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class2</span>)) <span class='op'>=&gt;</span> {
+                        <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>class2</span>);
+                    }
+                    <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>, .. }) <span class='op'>=&gt;</span> {
+                        <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>class</span>, <span class='ident'>chars</span>[<span class='number'>0</span>]));
+                    }
+                    <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>) <span class='op'>=&gt;</span> {
+                        <span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>e</span>);
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>err</span>));
+                    }
+                    <span class='comment'>// Because `parse_escape` can never return `LeftParen`.</span>
+                    _ <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+                },
+                <span class='ident'>start</span> <span class='op'>=&gt;</span> {
+                    <span class='self'>self</span>.<span class='ident'>bump</span>();
+                    <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>class</span>, <span class='ident'>start</span>));
+                }
+            }
+        }
+        <span class='kw'>if</span> <span class='ident'>negated</span> {
+            <span class='ident'>class</span> <span class='op'>=</span> <span class='ident'>class</span>.<span class='ident'>negate</span>();
+        }
+        <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>.<span class='ident'>canonicalize</span>())))
+    }
+
+    <span class='comment'>// Parses a single range in a character class.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Since this is a helper for `parse_class`, its signature sticks out.</span>
+    <span class='comment'>// Namely, it requires the start character of the range and the char</span>
+    <span class='comment'>// class to mutate.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// e.g., `[a-z]`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `-` (with start == `a`)</span>
+    <span class='comment'>// End:   `]`</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_class_range</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>class</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>CharClass</span>, <span class='ident'>start</span>: <span class='ident'>char</span>)
+                        <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;-&#39;</span>) {
+            <span class='comment'>// Not a range, so just push a singleton range.</span>
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='ident'>start</span>));
+            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(());
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+            <span class='comment'>// e.g., [a-</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>));
+        }
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>peek_is</span>(<span class='string'>&#39;]&#39;</span>) {
+            <span class='comment'>// This is the end of the class, so we permit use of `-` as a</span>
+            <span class='comment'>// regular char (just like we do in the beginning).</span>
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='ident'>start</span>));
+            <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>one</span>(<span class='string'>&#39;-&#39;</span>));
+            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(());
+        }
+
+        <span class='comment'>// We have a real range. Just need to check to parse literal and</span>
+        <span class='comment'>// make sure it&#39;s a valid range.</span>
+        <span class='kw'>let</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>cur</span>() {
+            <span class='string'>&#39;\\&#39;</span> <span class='op'>=&gt;</span> <span class='kw'>match</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>parse_escape</span>()) {
+                <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>, .. }) <span class='op'>=&gt;</span> <span class='ident'>chars</span>[<span class='number'>0</span>],
+                <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>) <span class='op'>=&gt;</span> {
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>e</span>)));
+                }
+                <span class='comment'>// Because `parse_escape` can never return `LeftParen`.</span>
+                _ <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+            },
+            _ <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>bump</span>(),
+        };
+        <span class='kw'>if</span> <span class='ident'>end</span> <span class='op'>&lt;</span> <span class='ident'>start</span> {
+            <span class='comment'>// e.g., [z-a]</span>
+            <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassRange</span> {
+                <span class='ident'>start</span>: <span class='ident'>start</span>,
+                <span class='ident'>end</span>: <span class='ident'>end</span>,
+            }));
+        }
+        <span class='ident'>class</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+        <span class='prelude-val'>Ok</span>(())
+    }
+
+    <span class='comment'>// Parses an ASCII class, e.g., `[:alnum:]+`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `[`</span>
+    <span class='comment'>// End:   `+`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Also supports negation, e.g., `[:^alnum:]`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This parsing routine is distinct from the others in that it doesn&#39;t</span>
+    <span class='comment'>// actually report any errors. Namely, if it fails, then the parser should</span>
+    <span class='comment'>// fall back to parsing a regular class.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This method will only make progress in the parser if it succeeds.</span>
+    <span class='comment'>// Otherwise, the input remains where it started.</span>
+    <span class='kw'>fn</span> <span class='ident'>maybe_parse_ascii</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+        <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+            <span class='ident'>p</span>.<span class='ident'>bump</span>(); <span class='comment'>// the `[`</span>
+            <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>p</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;:&#39;</span>) { <span class='kw'>return</span> <span class='prelude-val'>None</span>; }
+            <span class='kw'>let</span> <span class='ident'>negate</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;^&#39;</span>);
+            <span class='kw'>let</span> <span class='ident'>name</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>p</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;:&#39;</span>) {
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
+                <span class='prelude-val'>Some</span>(<span class='ident'>name</span>) <span class='op'>=&gt;</span> <span class='ident'>name</span>,
+            };
+            <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>p</span>.<span class='ident'>bump_if</span>(<span class='string'>&quot;:]&quot;</span>) { <span class='kw'>return</span> <span class='prelude-val'>None</span>; }
+            <span class='ident'>ascii_class</span>(<span class='kw-2'>&amp;</span><span class='ident'>name</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>negate</span> { <span class='ident'>c</span> } <span class='kw'>else</span> { <span class='ident'>c</span>.<span class='ident'>negate</span>() })
+        }
+        <span class='kw'>let</span> <span class='ident'>start</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chari</span>;
+        <span class='kw'>match</span> <span class='ident'>parse</span>(<span class='self'>self</span>) {
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> { <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>start</span>; <span class='prelude-val'>None</span> }
+            <span class='ident'>result</span> <span class='op'>=&gt;</span> <span class='ident'>result</span>,
+        }
+    }
+
+    <span class='comment'>// Parses a Uncode class name, e.g., `a\pLb`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `L`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// And also, `a\p{Greek}b`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Start: `{`</span>
+    <span class='comment'>// End:   `b`</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// `negate` is true when the class name is used with `\P`.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_unicode_class</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>neg</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>name</span> <span class='op'>=</span>
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;{&#39;</span>) {
+                <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>bump_get</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='string'>&#39;}&#39;</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>());
+                <span class='kw'>if</span> <span class='ident'>n</span>.<span class='ident'>is_empty</span>() <span class='op'>||</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>bump_if</span>(<span class='string'>&#39;}&#39;</span>) {
+                    <span class='comment'>// e.g., \p{Greek</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedUnicodeName</span>));
+                }
+                <span class='ident'>n</span>
+            } <span class='kw'>else</span> {
+                <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eof</span>() {
+                    <span class='comment'>// e.g., \p</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>));
+                }
+                <span class='self'>self</span>.<span class='ident'>bump</span>().<span class='ident'>to_string</span>()
+            };
+        <span class='kw'>match</span> <span class='ident'>unicode_class</span>(<span class='kw-2'>&amp;</span><span class='ident'>name</span>) {
+            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='ident'>name</span>))),
+            <span class='prelude-val'>Some</span>(<span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='kw'>if</span> <span class='ident'>neg</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>()) } <span class='kw'>else</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>cls</span>) },
+        }
+    }
+
+    <span class='comment'>// Parses a perl character class with Unicode support.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// `name` must be one of d, s, w, D, S, W. If not, this function panics.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// No parser state is changed.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_perl_class</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>name</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>regex</span>::{<span class='ident'>PERLD</span>, <span class='ident'>PERLS</span>, <span class='ident'>PERLW</span>};
+        <span class='kw'>match</span> <span class='ident'>name</span> {
+            <span class='string'>&#39;d&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLD</span>),
+            <span class='string'>&#39;D&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>(),
+            <span class='string'>&#39;s&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLS</span>),
+            <span class='string'>&#39;S&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>(),
+            <span class='string'>&#39;w&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLW</span>),
+            <span class='string'>&#39;W&#39;</span> <span class='op'>=&gt;</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>(),
+            _ <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+        }
+    }
+
+    <span class='comment'>// Always bump to the next input and return the given expression as a</span>
+    <span class='comment'>// `Build`.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This is mostly for convenience when the surrounding context implies</span>
+    <span class='comment'>// that the next character corresponds to the given expression.</span>
+    <span class='kw'>fn</span> <span class='ident'>parse_one</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>e</span>: <span class='ident'>Expr</span>) <span class='op'>-&gt;</span> <span class='ident'>Build</span> {
+        <span class='self'>self</span>.<span class='ident'>bump</span>();
+        <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)
+    }
+}
+
+<span class='comment'>// Auxiliary helper methods.</span>
+<span class='kw'>impl</span> <span class='ident'>Parser</span> {
+    <span class='kw'>fn</span> <span class='ident'>chars</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Chars</span> {
+        <span class='ident'>Chars</span>::<span class='ident'>new</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>chari</span>..], <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>ignore_space</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>bump</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+        <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cur</span>();
+        <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='self'>self</span>.<span class='ident'>chars</span>().<span class='ident'>next_count</span>());
+        <span class='ident'>c</span>
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>cur</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> { <span class='self'>self</span>.<span class='ident'>chars</span>().<span class='ident'>next</span>().<span class='ident'>unwrap</span>() }
+
+    <span class='kw'>fn</span> <span class='ident'>eof</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='self'>self</span>.<span class='ident'>chars</span>().<span class='ident'>next</span>().<span class='ident'>is_none</span>() }
+
+    <span class='kw'>fn</span> <span class='ident'>bump_get</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>match_end</span>(<span class='self'>self</span>);
+        <span class='kw'>if</span> <span class='ident'>n</span> <span class='op'>==</span> <span class='number'>0</span> {
+            <span class='prelude-val'>None</span>
+        } <span class='kw'>else</span> {
+            <span class='kw'>let</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='ident'>n</span>);
+            <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>chari</span>..<span class='ident'>end</span>]
+                        .<span class='ident'>iter</span>().<span class='ident'>cloned</span>().<span class='ident'>collect</span>::<span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>();
+            <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>end</span>;
+            <span class='prelude-val'>Some</span>(<span class='ident'>s</span>)
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>bump_if</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>match_end</span>(<span class='self'>self</span>);
+        <span class='kw'>if</span> <span class='ident'>n</span> <span class='op'>==</span> <span class='number'>0</span> {
+            <span class='boolval'>false</span>
+        } <span class='kw'>else</span> {
+            <span class='self'>self</span>.<span class='ident'>chari</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='ident'>n</span>);
+            <span class='boolval'>true</span>
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>peek_is</span><span class='op'>&lt;</span><span class='ident'>B</span>: <span class='ident'>Bumpable</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>s</span>.<span class='ident'>match_end</span>(<span class='self'>self</span>) <span class='op'>&gt;</span> <span class='number'>0</span>
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>err</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>) <span class='op'>-&gt;</span> <span class='ident'>Error</span> {
+        <span class='self'>self</span>.<span class='ident'>errat</span>(<span class='self'>self</span>.<span class='ident'>chari</span>, <span class='ident'>kind</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>errat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>pos</span>: <span class='ident'>usize</span>, <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>) <span class='op'>-&gt;</span> <span class='ident'>Error</span> {
+        <span class='ident'>Error</span> { <span class='ident'>pos</span>: <span class='ident'>pos</span>, <span class='ident'>surround</span>: <span class='self'>self</span>.<span class='ident'>windowat</span>(<span class='ident'>pos</span>), <span class='ident'>kind</span>: <span class='ident'>kind</span> }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>windowat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>pos</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+        <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='ident'>max</span>(<span class='number'>5</span>, <span class='ident'>pos</span>) <span class='op'>-</span> <span class='number'>5</span>;
+        <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>(), <span class='ident'>checkadd</span>(<span class='ident'>pos</span>, <span class='number'>5</span>));
+        <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='ident'>s</span>..<span class='ident'>e</span>].<span class='ident'>iter</span>().<span class='ident'>cloned</span>().<span class='ident'>collect</span>()
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>pop</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>expected</span>: <span class='ident'>ErrorKind</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+            <span class='prelude-val'>None</span> <span class='op'>|</span> <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span>{..}) <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>expected</span>)),
+            <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>e</span>),
+        }
+    }
+
+    <span class='comment'>// If the current contexts calls for case insensitivity and if the expr</span>
+    <span class='comment'>// given is a character class, do case folding on it and return the new</span>
+    <span class='comment'>// class.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Otherwise, return the expression unchanged.</span>
+    <span class='kw'>fn</span> <span class='ident'>maybe_class_case_fold</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>bexpr</span>: <span class='ident'>Build</span>) <span class='op'>-&gt;</span> <span class='ident'>Build</span> {
+        <span class='kw'>match</span> <span class='ident'>bexpr</span> {
+            <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>)) <span class='op'>=&gt;</span> {
+                <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(
+                    <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>flags</span>.<span class='ident'>casei</span> <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='ident'>cls</span>.<span class='ident'>casei</span> {
+                        <span class='ident'>cls</span>.<span class='ident'>case_fold</span>()
+                    } <span class='kw'>else</span> {
+                        <span class='ident'>cls</span>
+                    }
+                ))
+            }
+            <span class='ident'>bexpr</span> <span class='op'>=&gt;</span> <span class='ident'>bexpr</span>,
+        }
+    }
+}
+
+<span class='kw'>struct</span> <span class='ident'>Chars</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='ident'>chars</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> [<span class='ident'>char</span>],
+    <span class='ident'>cur</span>: <span class='ident'>usize</span>,
+    <span class='ident'>ignore_space</span>: <span class='ident'>bool</span>,
+    <span class='ident'>in_comment</span>: <span class='ident'>bool</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>Chars</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>char</span>;
+    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>skip</span>();
+        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>() {
+            <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>cur</span>];
+            <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>cur</span>, <span class='number'>1</span>);
+            <span class='prelude-val'>Some</span>(<span class='ident'>c</span>)
+        } <span class='kw'>else</span> {
+            <span class='prelude-val'>None</span>
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Chars</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>chars</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>char</span>], <span class='ident'>ignore_space</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='ident'>Chars</span> {
+        <span class='ident'>Chars</span> {
+            <span class='ident'>chars</span>: <span class='ident'>chars</span>,
+            <span class='ident'>cur</span>: <span class='number'>0</span>,
+            <span class='ident'>ignore_space</span>: <span class='ident'>ignore_space</span>,
+            <span class='ident'>in_comment</span>: <span class='boolval'>false</span>,
+        }
+    }
+
+    <span class='doccomment'>/// Skip line comments and whitespace</span>
+    <span class='kw'>fn</span> <span class='ident'>skip</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
+        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>ignore_space</span> { <span class='kw'>return</span>; }
+        <span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>() {
+            <span class='comment'>// Handle escaping of `#`, i.e. don&#39;t start a comment with `\#`.</span>
+            <span class='kw'>let</span> <span class='ident'>next_cur</span> <span class='op'>=</span> <span class='ident'>checkadd</span>(<span class='self'>self</span>.<span class='ident'>cur</span>, <span class='number'>1</span>);
+            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>c</span>() <span class='op'>==</span> <span class='string'>&#39;\\&#39;</span>
+                <span class='op'>&amp;&amp;</span> <span class='ident'>next_cur</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>len</span>()
+                <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='ident'>next_cur</span>] <span class='op'>==</span> <span class='string'>&#39;#&#39;</span>
+            {
+                <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>=</span> <span class='ident'>next_cur</span>;
+                <span class='kw'>break</span>;
+            }
+
+            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>c</span>() <span class='op'>==</span> <span class='string'>&#39;#&#39;</span> {
+                <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>c</span>() <span class='op'>==</span> <span class='string'>&#39;\n&#39;</span> {
+                <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>=</span> <span class='boolval'>false</span>;
+            }
+
+            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>in_comment</span> <span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>c</span>().<span class='ident'>is_whitespace</span>() {
+                <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>=</span> <span class='ident'>next_cur</span>;
+            } <span class='kw'>else</span> {
+                <span class='kw'>break</span>;
+            }
+        }
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>c</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+        <span class='self'>self</span>.<span class='ident'>chars</span>[<span class='self'>self</span>.<span class='ident'>cur</span>]
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>next_count</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='self'>self</span>.<span class='ident'>next</span>();
+        <span class='self'>self</span>.<span class='ident'>cur</span>
+    }
+}
+
+<span class='comment'>// Auxiliary methods for manipulating the expression stack.</span>
+<span class='kw'>impl</span> <span class='ident'>Parser</span> {
+    <span class='comment'>// Called whenever an alternate (`|`) is found.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This pops the expression stack until:</span>
+    <span class='comment'>//</span>
+    <span class='comment'>//  1. The stack is empty. Pushes an alternation with one arm.</span>
+    <span class='comment'>//  2. An opening parenthesis is found. Leave the parenthesis</span>
+    <span class='comment'>//     on the stack and push an alternation with one arm.</span>
+    <span class='comment'>//  3. An alternate (`|`) is found. Pop the existing alternation,</span>
+    <span class='comment'>//     add an arm and push the modified alternation.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Each &quot;arm&quot; in the above corresponds to the concatenation of all</span>
+    <span class='comment'>// popped expressions.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// In the first two cases, the stack is left in an invalid state</span>
+    <span class='comment'>// because an alternation with one arm is not allowed. This</span>
+    <span class='comment'>// particular state will be detected by `finish_concat` and an</span>
+    <span class='comment'>// error will be reported.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// In none of the cases is an empty arm allowed. If an empty arm</span>
+    <span class='comment'>// is found, an error is reported.</span>
+    <span class='kw'>fn</span> <span class='ident'>alternate</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Build</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>concat</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='kw'>let</span> <span class='ident'>alts</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>es</span><span class='op'>|</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='ident'>es</span>)));
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., |a</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='kw'>return</span> <span class='ident'>alts</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)]);
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>e</span> <span class='kw-2'>@</span> <span class='ident'>Build</span>::<span class='ident'>LeftParen</span>{..}) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., (|a)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>push</span>(<span class='ident'>e</span>);
+                    <span class='kw'>return</span> <span class='ident'>alts</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)]);
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='kw-2'>mut</span> <span class='ident'>es</span>))) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., a||</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>));
+                    <span class='kw'>return</span> <span class='ident'>alts</span>(<span class='ident'>es</span>);
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> { <span class='ident'>concat</span>.<span class='ident'>push</span>(<span class='ident'>e</span>); }
+            }
+        }
+    }
+
+    <span class='comment'>// Called whenever a closing parenthesis (`)`) is found.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This pops the expression stack until:</span>
+    <span class='comment'>//</span>
+    <span class='comment'>//  1. The stack is empty. An error is reported because this</span>
+    <span class='comment'>//     indicates an unopened parenthesis.</span>
+    <span class='comment'>//  2. An opening parenthesis is found. Pop the opening parenthesis</span>
+    <span class='comment'>//     and push a `Group` expression.</span>
+    <span class='comment'>//  3. An alternate (`|`) is found. Pop the existing alternation</span>
+    <span class='comment'>//     and an arm to it in place. Pop one more item from the stack.</span>
+    <span class='comment'>//     If the stack was empty, then report an unopened parenthesis</span>
+    <span class='comment'>//     error, otherwise assume it is an opening parenthesis and</span>
+    <span class='comment'>//     push a `Group` expression with the popped alternation.</span>
+    <span class='comment'>//     (We can assume this is an opening parenthesis because an</span>
+    <span class='comment'>//     alternation either corresponds to the entire Regex or it</span>
+    <span class='comment'>//     corresponds to an entire group. This is guaranteed by the</span>
+    <span class='comment'>//     `alternate` method.)</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Each &quot;arm&quot; in the above corresponds to the concatenation of all</span>
+    <span class='comment'>// popped expressions.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// Empty arms nor empty groups are allowed.</span>
+    <span class='kw'>fn</span> <span class='ident'>close_paren</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(<span class='ident'>Flags</span>, <span class='ident'>Build</span>)<span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>concat</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                <span class='comment'>// e.g., )</span>
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>)),
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> { <span class='ident'>i</span>, <span class='ident'>name</span>, <span class='ident'>old_flags</span>, .. }) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., ()</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyGroup</span>));
+                    }
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>((<span class='ident'>old_flags</span>, <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                        <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)),
+                        <span class='ident'>i</span>: <span class='ident'>i</span>,
+                        <span class='ident'>name</span>: <span class='ident'>name</span>,
+                    })));
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='kw-2'>mut</span> <span class='ident'>es</span>))) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., (a|)</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>));
+                    <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                        <span class='comment'>// e.g., a|b)</span>
+                        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>)),
+                        <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(_)) <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+                        <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span> { <span class='ident'>i</span>, <span class='ident'>name</span>, <span class='ident'>old_flags</span>, .. }) <span class='op'>=&gt;</span> {
+                            <span class='kw'>return</span> <span class='prelude-val'>Ok</span>((<span class='ident'>old_flags</span>, <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='ident'>es</span>)),
+                                <span class='ident'>i</span>: <span class='ident'>i</span>,
+                                <span class='ident'>name</span>: <span class='ident'>name</span>,
+                            })));
+                        }
+                    }
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> { <span class='ident'>concat</span>.<span class='ident'>push</span>(<span class='ident'>e</span>); }
+            }
+        }
+    }
+
+    <span class='comment'>// Called only when the parser reaches the end of input.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// This pops the expression stack until:</span>
+    <span class='comment'>//</span>
+    <span class='comment'>//  1. The stack is empty. Return concatenation of popped</span>
+    <span class='comment'>//     expressions. This concatenation may be empty!</span>
+    <span class='comment'>//  2. An alternation is found. Pop the alternation and push</span>
+    <span class='comment'>//     a new arm. Return the alternation as the entire Regex.</span>
+    <span class='comment'>//</span>
+    <span class='comment'>// If an opening parenthesis is popped, then an error is</span>
+    <span class='comment'>// returned since it indicates an unclosed parenthesis.</span>
+    <span class='kw'>fn</span> <span class='ident'>finish_concat</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>concat</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stack</span>.<span class='ident'>pop</span>() {
+                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> { <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>)); }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>LeftParen</span>{ <span class='ident'>chari</span>, ..}) <span class='op'>=&gt;</span> {
+                    <span class='comment'>// e.g., a(b</span>
+                    <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>errat</span>(<span class='ident'>chari</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedParen</span>));
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='kw-2'>mut</span> <span class='ident'>es</span>))) <span class='op'>=&gt;</span> {
+                    <span class='kw'>if</span> <span class='ident'>concat</span>.<span class='ident'>is_empty</span>() {
+                        <span class='comment'>// e.g., a|</span>
+                        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='self'>self</span>.<span class='ident'>err</span>(<span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>));
+                    }
+                    <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>rev_concat</span>(<span class='ident'>concat</span>));
+                    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='ident'>es</span>));
+                }
+                <span class='prelude-val'>Some</span>(<span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>e</span>)) <span class='op'>=&gt;</span> { <span class='ident'>concat</span>.<span class='ident'>push</span>(<span class='ident'>e</span>); }
+            }
+        }
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Build</span> {
+    <span class='kw'>fn</span> <span class='ident'>is_empty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>Build</span>::<span class='ident'>Expr</span>(<span class='ident'>Expr</span>::<span class='ident'>Empty</span>) <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+            _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+        }
+    }
+}
+
+<span class='comment'>// Make it ergonomic to conditionally bump the parser.</span>
+<span class='comment'>// i.e., `bump_if(&#39;a&#39;)` or `bump_if(&quot;abc&quot;)`.</span>
+<span class='kw'>trait</span> <span class='ident'>Bumpable</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span>;
+}
+
+<span class='kw'>impl</span> <span class='ident'>Bumpable</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>chars</span>();
+        <span class='kw'>if</span> <span class='ident'>chars</span>.<span class='ident'>next</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='self'>self</span>).<span class='ident'>unwrap_or</span>(<span class='boolval'>false</span>) {
+            <span class='ident'>chars</span>.<span class='ident'>cur</span>
+        } <span class='kw'>else</span> {
+            <span class='number'>0</span>
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Bumpable</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>search</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rest</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>chars</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='number'>0</span>;
+        <span class='kw'>loop</span> {
+            <span class='kw'>match</span> (<span class='ident'>rest</span>.<span class='ident'>next</span>(), <span class='ident'>search</span>.<span class='ident'>next</span>()) {
+                (<span class='prelude-val'>Some</span>(<span class='ident'>c1</span>), <span class='prelude-val'>Some</span>(<span class='ident'>c2</span>)) <span class='kw'>if</span> <span class='ident'>c1</span> <span class='op'>==</span> <span class='ident'>c2</span> <span class='op'>=&gt;</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>rest</span>.<span class='ident'>cur</span>,
+                (_, <span class='prelude-val'>None</span>) <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='ident'>count</span>,
+                _ <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='number'>0</span>,
+            }
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>FnMut</span>(<span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span><span class='op'>&gt;</span> <span class='ident'>Bumpable</span> <span class='kw'>for</span> <span class='ident'>F</span> {
+    <span class='kw'>fn</span> <span class='ident'>match_end</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>chars</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='number'>0</span>;
+        <span class='kw'>while</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>c</span>) <span class='op'>=</span> <span class='ident'>chars</span>.<span class='ident'>next</span>() {
+            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>(<span class='ident'>c</span>) {
+                <span class='kw'>break</span>
+            }
+            <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>chars</span>.<span class='ident'>cur</span>;
+        }
+        <span class='ident'>count</span>
+    }
+}
+
+<span class='comment'>// Turn a sequence of expressions into a concatenation.</span>
+<span class='comment'>// This only uses `Concat` if there are 2 or more expressions.</span>
+<span class='kw'>fn</span> <span class='ident'>rev_concat</span>(<span class='kw-2'>mut</span> <span class='ident'>exprs</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> {
+    <span class='kw'>if</span> <span class='ident'>exprs</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>0</span> {
+        <span class='ident'>Expr</span>::<span class='ident'>Empty</span>
+    } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>exprs</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span> {
+        <span class='ident'>exprs</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>()
+    } <span class='kw'>else</span> {
+        <span class='ident'>exprs</span>.<span class='ident'>reverse</span>();
+        <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='ident'>exprs</span>)
+    }
+}
+
+<span class='comment'>// Returns true if and only if the given character is allowed in a capture</span>
+<span class='comment'>// name. Note that the first char of a capture name must not be numeric.</span>
+<span class='kw'>fn</span> <span class='ident'>is_valid_capture_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>&#39;_&#39;</span> <span class='op'>||</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;9&#39;</span>)
+    <span class='op'>||</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;a&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;z&#39;</span>) <span class='op'>||</span> (<span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>&#39;A&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>&#39;Z&#39;</span>)
+}
+
+<span class='doccomment'>/// Returns true if the give character has significance in a regex.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_punct</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='kw'>match</span> <span class='ident'>c</span> {
+        <span class='string'>&#39;\\&#39;</span> <span class='op'>|</span> <span class='string'>&#39;.&#39;</span> <span class='op'>|</span> <span class='string'>&#39;+&#39;</span> <span class='op'>|</span> <span class='string'>&#39;*&#39;</span> <span class='op'>|</span> <span class='string'>&#39;?&#39;</span> <span class='op'>|</span> <span class='string'>&#39;(&#39;</span> <span class='op'>|</span> <span class='string'>&#39;)&#39;</span> <span class='op'>|</span> <span class='string'>&#39;|&#39;</span> <span class='op'>|</span>
+        <span class='string'>&#39;[&#39;</span> <span class='op'>|</span> <span class='string'>&#39;]&#39;</span> <span class='op'>|</span> <span class='string'>&#39;{&#39;</span> <span class='op'>|</span> <span class='string'>&#39;}&#39;</span> <span class='op'>|</span> <span class='string'>&#39;^&#39;</span> <span class='op'>|</span> <span class='string'>&#39;$&#39;</span> <span class='op'>|</span> <span class='string'>&#39;#&#39;</span> <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+        _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+    }
+}
+
+<span class='kw'>fn</span> <span class='ident'>checkadd</span>(<span class='ident'>x</span>: <span class='ident'>usize</span>, <span class='ident'>y</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+    <span class='ident'>x</span>.<span class='ident'>checked_add</span>(<span class='ident'>y</span>).<span class='ident'>expect</span>(<span class='string'>&quot;regex length overflow&quot;</span>)
+}
+
+<span class='kw'>fn</span> <span class='ident'>unicode_class</span>(<span class='ident'>name</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+    <span class='ident'>UNICODE_CLASSES</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, _)<span class='op'>|</span> <span class='ident'>s</span>.<span class='ident'>cmp</span>(<span class='ident'>name</span>)).<span class='ident'>ok</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> {
+        <span class='ident'>raw_class_to_expr</span>(<span class='ident'>UNICODE_CLASSES</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+    })
+}
+
+<span class='kw'>fn</span> <span class='ident'>ascii_class</span>(<span class='ident'>name</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>CharClass</span><span class='op'>&gt;</span> {
+    <span class='ident'>ASCII_CLASSES</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, _)<span class='op'>|</span> <span class='ident'>s</span>.<span class='ident'>cmp</span>(<span class='ident'>name</span>)).<span class='ident'>ok</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> {
+        <span class='ident'>raw_class_to_expr</span>(<span class='ident'>ASCII_CLASSES</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+    })
+}
+
+<span class='kw'>fn</span> <span class='ident'>raw_class_to_expr</span>(<span class='ident'>raw</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+    <span class='kw'>let</span> <span class='ident'>range</span> <span class='op'>=</span> <span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, <span class='ident'>e</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>s</span>, <span class='ident'>end</span>: <span class='ident'>e</span> };
+    <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>raw</span>.<span class='ident'>iter</span>().<span class='ident'>map</span>(<span class='ident'>range</span>).<span class='ident'>collect</span>())
+}
+
+<span class='kw'>type</span> <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [(<span class='ident'>char</span>, <span class='ident'>char</span>)];
+<span class='kw'>type</span> <span class='ident'>NamedClasses</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span>, <span class='ident'>Class</span>)];
+
+<span class='kw'>const</span> <span class='ident'>ASCII_CLASSES</span>: <span class='ident'>NamedClasses</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[
+    <span class='comment'>// Classes must be in alphabetical order so that bsearch works.</span>
+    <span class='comment'>// [:alnum:]      alphanumeric (== [0-9A-Za-z])</span>
+    <span class='comment'>// [:alpha:]      alphabetic (== [A-Za-z])</span>
+    <span class='comment'>// [:ascii:]      ASCII (== [\x00-\x7F])</span>
+    <span class='comment'>// [:blank:]      blank (== [\t ])</span>
+    <span class='comment'>// [:cntrl:]      control (== [\x00-\x1F\x7F])</span>
+    <span class='comment'>// [:digit:]      digits (== [0-9])</span>
+    <span class='comment'>// [:graph:]      graphical (== [!-~])</span>
+    <span class='comment'>// [:lower:]      lower case (== [a-z])</span>
+    <span class='comment'>// [:print:]      printable (== [ -~] == [ [:graph:]])</span>
+    <span class='comment'>// [:punct:]      punctuation (== [!-/:-@[-`{-~])</span>
+    <span class='comment'>// [:space:]      whitespace (== [\t\n\v\f\r ])</span>
+    <span class='comment'>// [:upper:]      upper case (== [A-Z])</span>
+    <span class='comment'>// [:word:]       word characters (== [0-9A-Za-z_])</span>
+    <span class='comment'>// [:xdigit:]     hex digit (== [0-9A-Fa-f])</span>
+    <span class='comment'>// Taken from: http://golang.org/pkg/regex/syntax/</span>
+    (<span class='string'>&quot;alnum&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>ALNUM</span>),
+    (<span class='string'>&quot;alpha&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>ALPHA</span>),
+    (<span class='string'>&quot;ascii&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>ASCII</span>),
+    (<span class='string'>&quot;blank&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>BLANK</span>),
+    (<span class='string'>&quot;cntrl&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>CNTRL</span>),
+    (<span class='string'>&quot;digit&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>DIGIT</span>),
+    (<span class='string'>&quot;graph&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>GRAPH</span>),
+    (<span class='string'>&quot;lower&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>LOWER</span>),
+    (<span class='string'>&quot;print&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>PRINT</span>),
+    (<span class='string'>&quot;punct&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>PUNCT</span>),
+    (<span class='string'>&quot;space&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>SPACE</span>),
+    (<span class='string'>&quot;upper&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>UPPER</span>),
+    (<span class='string'>&quot;word&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>WORD</span>),
+    (<span class='string'>&quot;xdigit&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>XDIGIT</span>),
+];
+
+<span class='kw'>const</span> <span class='ident'>ALNUM</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>ALPHA</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>ASCII</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x7F&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>BLANK</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39; &#39;</span>, <span class='string'>&#39; &#39;</span>), (<span class='string'>&#39;\t&#39;</span>, <span class='string'>&#39;\t&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>CNTRL</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x1F&#39;</span>), (<span class='string'>&#39;\x7F&#39;</span>, <span class='string'>&#39;\x7F&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>DIGIT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>GRAPH</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;!&#39;</span>, <span class='string'>&#39;~&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>LOWER</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>PRINT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39; &#39;</span>, <span class='string'>&#39;~&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>PUNCT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;!&#39;</span>, <span class='string'>&#39;/&#39;</span>), (<span class='string'>&#39;:&#39;</span>, <span class='string'>&#39;@&#39;</span>), (<span class='string'>&#39;[&#39;</span>, <span class='string'>&#39;`&#39;</span>), (<span class='string'>&#39;{&#39;</span>, <span class='string'>&#39;~&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>SPACE</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\t&#39;</span>, <span class='string'>&#39;\t&#39;</span>), (<span class='string'>&#39;\n&#39;</span>, <span class='string'>&#39;\n&#39;</span>), (<span class='string'>&#39;\x0B&#39;</span>, <span class='string'>&#39;\x0B&#39;</span>),
+                       (<span class='string'>&#39;\x0C&#39;</span>, <span class='string'>&#39;\x0C&#39;</span>), (<span class='string'>&#39;\r&#39;</span>, <span class='string'>&#39;\r&#39;</span>), (<span class='string'>&#39; &#39;</span>, <span class='string'>&#39; &#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>UPPER</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>WORD</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>)];
+<span class='kw'>const</span> <span class='ident'>XDIGIT</span>: <span class='ident'>Class</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;0&#39;</span>, <span class='string'>&#39;9&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;F&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;f&#39;</span>)];
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>tests</span> {
+    <span class='kw'>use</span> { <span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>, <span class='ident'>Expr</span>, <span class='ident'>Repeater</span>, <span class='ident'>ErrorKind</span> };
+    <span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>regex</span>::{<span class='ident'>PERLD</span>, <span class='ident'>PERLS</span>, <span class='ident'>PERLW</span>};
+    <span class='kw'>use</span> <span class='ident'>super</span>::<span class='ident'>Parser</span>;
+    <span class='kw'>use</span> <span class='ident'>super</span>::{<span class='ident'>LOWER</span>, <span class='ident'>UPPER</span>};
+
+    <span class='kw'>static</span> <span class='ident'>YI</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [(<span class='ident'>char</span>, <span class='ident'>char</span>)] <span class='op'>=</span> <span class='kw-2'>&amp;</span>[
+        (<span class='string'>&#39;\u{a000}&#39;</span>, <span class='string'>&#39;\u{a48c}&#39;</span>), (<span class='string'>&#39;\u{a490}&#39;</span>, <span class='string'>&#39;\u{a4c6}&#39;</span>),
+    ];
+
+    <span class='kw'>fn</span> <span class='ident'>p</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='ident'>s</span>).<span class='ident'>unwrap</span>() }
+    <span class='kw'>fn</span> <span class='ident'>lit</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>], <span class='ident'>casei</span>: <span class='boolval'>false</span> } }
+    <span class='kw'>fn</span> <span class='ident'>liti</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>c</span>], <span class='ident'>casei</span>: <span class='boolval'>true</span> } }
+    <span class='kw'>fn</span> <span class='ident'>b</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>(<span class='ident'>v</span>: <span class='ident'>T</span>) <span class='op'>-&gt;</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> { <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>v</span>) }
+    <span class='kw'>fn</span> <span class='ident'>c</span>(<span class='ident'>es</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>Expr</span>]) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> { <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='ident'>es</span>.<span class='ident'>to_vec</span>()) }
+
+    <span class='kw'>fn</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>ranges</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>()
+                           .<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)).<span class='ident'>collect</span>();
+        <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>ranges</span>)
+    }
+
+    <span class='kw'>fn</span> <span class='ident'>classes</span>(<span class='ident'>classes</span>: <span class='kw-2'>&amp;</span>[<span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>();
+        <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='ident'>ranges</span> <span class='kw'>in</span> <span class='ident'>classes</span> {
+            <span class='ident'>cls</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>class</span>(<span class='ident'>ranges</span>));
+        }
+        <span class='ident'>cls</span>.<span class='ident'>canonicalize</span>()
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>empty</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Empty</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>literal_string</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;ab&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>start_literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;^a&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>StartText</span>,
+            <span class='ident'>Expr</span>::<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='string'>&#39;a&#39;</span>], <span class='ident'>casei</span>: <span class='boolval'>false</span> },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_one_greedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_one_greedy_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;ab?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+            },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_one_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a??&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrOne</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_one_or_more_greedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a+&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>OneOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_one_or_more_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a+?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>OneOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_more_greedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a*&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_zero_or_more_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a*?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_exact</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>5</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min_max</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,10}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>10</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_exact_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5}?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>5</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,}?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> },
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_min_max_nongreedy</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{5,10}?&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>10</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>repeat_counted_whitespace</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{ 5   }&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>5</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a{ 5 , 10 }&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='number'>5</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='number'>10</span>) },
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_literal_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(ab)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_two</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a|b&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_many</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;a|b|c&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_many_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;ab|bc|cd&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]),
+            <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)]),
+            <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;d&#39;</span>)]),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_two</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a|b)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_many</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a|b|c)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_many_concat</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(ab|bc|cd)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]),
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)]),
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;d&#39;</span>)]),
+            ])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>alt_group_nested</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(ab|(bc|(cd)))&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+                <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>)]),
+                <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                    <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+                        <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>)]),
+                        <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;d&#39;</span>)])),
+                            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>3</span>),
+                            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+                        }
+                    ])),
+                    <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>2</span>),
+                    <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+                },
+            ])),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_name</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?P&lt;foo&gt;a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='string'>&quot;foo&quot;</span>.<span class='ident'>into</span>()),
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_no_capture</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?:a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_flags</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i:a)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+            <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_flags_returned</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i:a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>group_flags_retained</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)(?-i:a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)a&quot;</span>), <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_multiple</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?is)a.&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>Expr</span>::<span class='ident'>AnyChar</span>]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_multiline</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?m)^(?-m)$&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>Expr</span>::<span class='ident'>StartLine</span>, <span class='ident'>Expr</span>::<span class='ident'>EndText</span>]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_swap_greed</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?U)a*a*?(?i-U)a*a*?&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+            },
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+            },
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+            },
+            <span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+                <span class='ident'>greedy</span>: <span class='boolval'>false</span>,
+            },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_multiple_negate_one</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?is)a.(?i-s)a.&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>Expr</span>::<span class='ident'>AnyChar</span>, <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>Expr</span>::<span class='ident'>AnyCharNoNL</span>,
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_inline_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)a(?-i)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_group_inline</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(a(?i)a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>)])),
+                <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>flags_group_inline_retain</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)((?-i)a)a&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+            <span class='ident'>liti</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_simple</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\a\f\t\n\r\v&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;\x07&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\x0C&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\t&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;\n&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\r&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\x0B&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_boundaries</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\A\z\b\B&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>StartText</span>, <span class='ident'>Expr</span>::<span class='ident'>EndText</span>,
+            <span class='ident'>Expr</span>::<span class='ident'>WordBoundary</span>, <span class='ident'>Expr</span>::<span class='ident'>NotWordBoundary</span>,
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_punctuation</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;\\&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;.&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;+&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;*&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;?&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;(&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;)&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;|&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;[&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;{&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;}&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;^&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;$&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_octal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\123&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\1234&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;4&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_hex2</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x53&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x534&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;4&#39;</span>)]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_hex</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x{53}&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x{53}4&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>lit</span>(<span class='string'>&#39;S&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;4&#39;</span>)]));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\x{2603}&quot;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;\u{2603}&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\p{Yi}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\pZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\p{Yi}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\pZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ]).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\P{Yi}&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\PZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ]).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_name_negate_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\P{Yi}&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_unicode_letter_negate_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\PZ&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\u{20}&#39;</span>, <span class='string'>&#39;\u{20}&#39;</span>), (<span class='string'>&#39;\u{a0}&#39;</span>, <span class='string'>&#39;\u{a0}&#39;</span>),
+            (<span class='string'>&#39;\u{1680}&#39;</span>, <span class='string'>&#39;\u{1680}&#39;</span>), (<span class='string'>&#39;\u{2000}&#39;</span>, <span class='string'>&#39;\u{200a}&#39;</span>),
+            (<span class='string'>&#39;\u{2028}&#39;</span>, <span class='string'>&#39;\u{2029}&#39;</span>), (<span class='string'>&#39;\u{202f}&#39;</span>, <span class='string'>&#39;\u{202f}&#39;</span>),
+            (<span class='string'>&#39;\u{205f}&#39;</span>, <span class='string'>&#39;\u{205f}&#39;</span>), (<span class='string'>&#39;\u{3000}&#39;</span>, <span class='string'>&#39;\u{3000}&#39;</span>),
+        ]).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\d&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\s&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\w&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\D&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\S&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;\W&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\d&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\s&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\w&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_d_case_fold_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\D&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_s_case_fold_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\S&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>escape_perl_w_case_fold_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)\W&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[a]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\x00]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x00&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\n&#39;</span>, <span class='string'>&#39;\n&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\n&#39;</span>, <span class='string'>&#39;\n&#39;</span>)])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^a]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\x00]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x01&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x09&#39;</span>), (<span class='string'>&#39;\x0b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[^\n]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+            (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x09&#39;</span>), (<span class='string'>&#39;\x0b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\d]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\d]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\w]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\s]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\D]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\W]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\S]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[\d]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\d]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\w]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\s]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_singleton_class_negate_negate_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\D]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\W]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLW</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\S]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLS</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ]).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate_negate</span>() {
+        <span class='kw'>let</span> <span class='ident'>nperld</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>nyi</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>().<span class='ident'>merge</span>(<span class='ident'>nperld</span>).<span class='ident'>merge</span>(<span class='ident'>nyi</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[^\D\P{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ]).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate_casei</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\d\p{Yi}]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>PERLD</span>, <span class='ident'>YI</span>,
+        ]).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_multiple_class_negate_negate_casei</span>() {
+        <span class='kw'>let</span> <span class='ident'>nperld</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>nyi</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>YI</span>).<span class='ident'>negate</span>();
+        <span class='kw'>let</span> <span class='ident'>class</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>().<span class='ident'>merge</span>(<span class='ident'>nperld</span>).<span class='ident'>merge</span>(<span class='ident'>nyi</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?i)[^\D\P{Yi}]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>.<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_class_hypen</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\p{Yi}-]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>)], <span class='ident'>YI</span>,
+        ])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;[\p{Yi}-a]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[
+            <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>)], <span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)], <span class='ident'>YI</span>,
+        ])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_brackets</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;]&#39;</span>, <span class='string'>&#39;]&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[][]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;[&#39;</span>, <span class='string'>&#39;[&#39;</span>), (<span class='string'>&#39;]&#39;</span>, <span class='string'>&#39;]&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;[&#39;</span>, <span class='string'>&#39;[&#39;</span>)])),
+            <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_brackets_hypen</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[]-]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>), (<span class='string'>&#39;]&#39;</span>, <span class='string'>&#39;]&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[-]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;-&#39;</span>, <span class='string'>&#39;-&#39;</span>)])),
+            <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>class_overlapping</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[a-fd-h]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;h&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[a-fg-m]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;m&#39;</span>)])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[:upper:]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_not</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[:abc:]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;:&#39;</span>, <span class='string'>&#39;:&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>)])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_multiple</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:lower:][:upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>classes</span>(<span class='kw-2'>&amp;</span>[<span class='ident'>UPPER</span>, <span class='ident'>LOWER</span>])));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_negate</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>negate</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[^[:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_negate_multiple</span>() {
+        <span class='kw'>let</span> (<span class='ident'>nlower</span>, <span class='ident'>nupper</span>) <span class='op'>=</span> (<span class='ident'>class</span>(<span class='ident'>LOWER</span>).<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>negate</span>());
+        <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>CharClass</span>::<span class='ident'>empty</span>().<span class='ident'>merge</span>(<span class='ident'>nlower</span>).<span class='ident'>merge</span>(<span class='ident'>nupper</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[[:^lower:][:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;[^[:^lower:][:^upper:]]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[:upper:]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[[:upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ascii_class_negate_case_fold</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[[:^upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>negate</span>().<span class='ident'>case_fold</span>()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?i)[^[:^upper:]]&quot;</span>),
+                   <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>UPPER</span>).<span class='ident'>case_fold</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_literal</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x) a b c&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_literal_off</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x) a b c(?-x) a&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;b&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;c&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39; &#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_class</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x)[a
+        - z
+]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)])));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>&quot;(?x)[  ^   a
+        - z
+]&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)]).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_escape</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)\ d&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>)));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)\
+                     D&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>).<span class='ident'>negate</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_comments</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)(?P&lt;foo&gt;
+    a # comment 1
+)(?P&lt;bar&gt;
+    z # comment 2
+)&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+        <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>1</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='string'>&quot;foo&quot;</span>.<span class='ident'>into</span>()),
+        },
+        <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+            <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>lit</span>(<span class='string'>&#39;z&#39;</span>)),
+            <span class='ident'>i</span>: <span class='prelude-val'>Some</span>(<span class='number'>2</span>),
+            <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='string'>&quot;bar&quot;</span>.<span class='ident'>into</span>()),
+        },
+    ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_comments_re_enable</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)a # hi
+(?-x:#) # sweet&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+            <span class='ident'>Expr</span>::<span class='ident'>Group</span> {
+                <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>)),
+                <span class='ident'>i</span>: <span class='prelude-val'>None</span>,
+                <span class='ident'>name</span>: <span class='prelude-val'>None</span>,
+            },
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_escape_punctuation</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#&quot;</span>), <span class='ident'>c</span>(<span class='kw-2'>&amp;</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;\\&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;.&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;+&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;*&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;?&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;(&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;)&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;|&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;[&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;]&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;{&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;}&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;^&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;$&#39;</span>), <span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>),
+        ]));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>ignore_space_escape_hash</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>p</span>(<span class='string'>r&quot;(?x)a\# # hi there&quot;</span>), <span class='ident'>Expr</span>::<span class='ident'>Concat</span>(<span class='macro'>vec</span><span class='macro'>!</span>[
+            <span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>),
+            <span class='ident'>lit</span>(<span class='string'>&#39;#&#39;</span>),
+        ]));
+    }
+
+    <span class='comment'>// Test every single possible error case.</span>
+
+    <span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>test_err</span> {
+        (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>re</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>pos</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>kind</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> {{
+            <span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>re</span>).<span class='ident'>unwrap_err</span>();
+            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>pos</span>, <span class='ident'>err</span>.<span class='ident'>pos</span>);
+            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>kind</span>, <span class='ident'>err</span>.<span class='ident'>kind</span>);
+            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>re</span>.<span class='ident'>contains</span>(<span class='kw-2'>&amp;</span><span class='ident'>err</span>.<span class='ident'>surround</span>));
+        }}
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_no_expr_simple</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(*&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_no_expr_counted</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;({5}&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_beginning_counted</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;{5}&quot;</span>, <span class='number'>0</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterExpectsExpr</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_illegal_exprs_simple</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a**&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        }));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|*&quot;</span>, <span class='number'>2</span>,
+            <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)]))
+        );
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_illegal_exprs_counted</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a*{5}&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Repeat</span> {
+            <span class='ident'>e</span>: <span class='ident'>b</span>(<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)),
+            <span class='ident'>r</span>: <span class='ident'>Repeater</span>::<span class='ident'>ZeroOrMore</span>,
+            <span class='ident'>greedy</span>: <span class='boolval'>true</span>,
+        }));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|{5}&quot;</span>, <span class='number'>2</span>,
+            <span class='ident'>ErrorKind</span>::<span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>::<span class='ident'>Alternate</span>(<span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>lit</span>(<span class='string'>&#39;a&#39;</span>)]))
+        );
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_empty_number</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{}&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>MissingBase10</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{5&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedRepeat</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_empty_number_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{xyz&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;xyz&quot;</span>.<span class='ident'>into</span>()));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{12,xyz&quot;</span>, <span class='number'>8</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;xyz&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_invalid_number</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{9999999999}&quot;</span>, <span class='number'>12</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;9999999999&quot;</span>.<span class='ident'>into</span>()));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{1,9999999999}&quot;</span>, <span class='number'>14</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;9999999999&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_invalid_number_extra</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{12x}&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;12x&quot;</span>.<span class='ident'>into</span>()));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{1,12x}&quot;</span>, <span class='number'>7</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase10</span>(<span class='string'>&quot;12x&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_repeat_invalid_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a{2,1}&quot;</span>, <span class='number'>5</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidRepeatRange</span> { <span class='ident'>min</span>: <span class='number'>2</span>, <span class='ident'>max</span>: <span class='number'>1</span> });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_alternate_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;|a&quot;</span>, <span class='number'>0</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_alternate_empty_with_group</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(|a)&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_alternate_empty_with_alternate</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a||&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_unopened_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;)&quot;</span>, <span class='number'>0</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_unopened</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;ab)&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_unopened_with_alt</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|b)&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnopenedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_empty_alt</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(a|)&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_empty_group</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;()&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyGroup</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_close_paren_empty_group_with_name</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;foo&gt;)&quot;</span>, <span class='number'>8</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyGroup</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_finish_concat_unclosed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;ab(xy&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedParen</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_finish_concat_empty_alt</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;a|&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyAlternate</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_invalid</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;a#&gt;x)&quot;</span>, <span class='number'>6</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidCaptureName</span>(<span class='string'>&quot;a#&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_invalid_leading</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;1a&gt;a)&quot;</span>, <span class='number'>6</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidCaptureName</span>(<span class='string'>&quot;1a&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_unexpected_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;a&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedCaptureName</span>(<span class='string'>&quot;a&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_name_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;&gt;a)&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyCaptureName</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_unrecognized_flag</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?z:a)&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedFlag</span>(<span class='string'>&#39;z&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_unexpected_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?i&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedFlagEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_double_negation</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?-i-s:a)&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>DoubleFlagNegation</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_empty_negation</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?i-:a)&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_group_opts_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?)&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>EmptyFlagNegation</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_unexpected_eof</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_unrecognized</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\m&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedEscape</span>(<span class='string'>&#39;m&#39;</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex2_eof0</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedTwoDigitHexEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex2_eof1</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\xA&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedTwoDigitHexEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex2_invalid</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\xAG&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;AG&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_eof0</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_eof1</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{A&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedHex</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{AG}&quot;</span>, <span class='number'>5</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;AG&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid_scalar_value_surrogate</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{D800}&quot;</span>, <span class='number'>7</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidScalarValue</span>(<span class='number'>0xD800</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid_scalar_value_high</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{110000}&quot;</span>, <span class='number'>9</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidScalarValue</span>(<span class='number'>0x110000</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_escape_hex_invalid_u32</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\x{9999999999}&quot;</span>, <span class='number'>13</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidBase16</span>(<span class='string'>&quot;9999999999&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_unclosed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p{&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedUnicodeName</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p{Greek&quot;</span>, <span class='number'>8</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnclosedUnicodeName</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_no_letter</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedEscapeEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_unknown_letter</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\pA&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='string'>&quot;A&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_unicode_unknown_name</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;\p{Yii}&quot;</span>, <span class='number'>7</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='string'>&quot;Yii&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_eof_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[&quot;</span>, <span class='number'>1</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_eof_non_empty</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[a&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^a&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_eof_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[a-&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^a-&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[---&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_invalid_escape</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[\pA]&quot;</span>, <span class='number'>4</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>UnrecognizedUnicodeClass</span>(<span class='string'>&quot;A&quot;</span>.<span class='ident'>into</span>()));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_valid_escape_not_allowed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[\A]&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_range_valid_escape_not_allowed</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[a-\d]&quot;</span>, <span class='number'>5</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>Class</span>(<span class='ident'>class</span>(<span class='ident'>PERLD</span>))));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[a-\A]&quot;</span>, <span class='number'>5</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>));
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>r&quot;[\A-a]&quot;</span>, <span class='number'>3</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>::<span class='ident'>StartText</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_invalid_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[z-a]&quot;</span>, <span class='number'>4</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>InvalidClassRange</span> {
+            <span class='ident'>start</span>: <span class='string'>&#39;z&#39;</span>,
+            <span class='ident'>end</span>: <span class='string'>&#39;a&#39;</span>,
+        });
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_class_empty_range</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[]&quot;</span>, <span class='number'>2</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;[^]&quot;</span>, <span class='number'>3</span>, <span class='ident'>ErrorKind</span>::<span class='ident'>UnexpectedClassEof</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>error_duplicate_capture_name</span>() {
+        <span class='macro'>test_err</span><span class='macro'>!</span>(<span class='string'>&quot;(?P&lt;a&gt;.)(?P&lt;a&gt;.)&quot;</span>, <span class='number'>14</span>,
+                  <span class='ident'>ErrorKind</span>::<span class='ident'>DuplicateCaptureName</span>(<span class='string'>&quot;a&quot;</span>.<span class='ident'>into</span>()));
+    }
+}
+</pre>
+</section>
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author		2015-06-29 20:16:15 +0000
committer		2015-06-29 20:16:15 +0000
commit	64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree	8c64d6e8be006486d975a651505fbbde61365cd6 /src/regex_syntax
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