Viewing github.com/alecthomas/chroma/lexers/embedded/rust.xml

```
<lexer>
```
```
  <config>
```
```
    <name>Rust</name>
```
```
    <alias>rust</alias>
```
```
    <alias>rs</alias>
```
```
    <filename>*.rs</filename>
```
```
    <filename>*.rs.in</filename>
```
```
    <mime_type>text/rust</mime_type>
```
```
    <mime_type>text/x-rust</mime_type>
```
```
    <ensure_nl>true</ensure_nl>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="modname">
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="NameNamespace"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="lifetime">
```
```
      <rule pattern="[a-zA-Z_]+\w*">
```
```
        <token type="NameAttribute"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="number_lit">
```

      <rule pattern="[ui](8|16|32|64|size)">

```
        <token type="Keyword"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="f(32|64)">
```
```
        <token type="Keyword"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="attribute_common">
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <push state="string"/>
```
```
      </rule>
```
```
      <rule pattern="\[">
```
```
        <token type="CommentPreproc"/>
```
```
        <push state="attribute["/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="bytestring">
```

      <rule pattern="\\x[89a-fA-F][0-9a-fA-F]">

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule>
```
```
        <include state="string"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="comment">
```
```
      <rule pattern="[^*/]+">
```

        <token type="CommentMultiline"/>

```
      </rule>
```
```
      <rule pattern="/\*">
```

        <token type="CommentMultiline"/>

```
        <push/>
```
```
      </rule>
```
```
      <rule pattern="\*/">
```

        <token type="CommentMultiline"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="[*/]">
```

        <token type="CommentMultiline"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="doccomment">
```
```
      <rule pattern="[^*/]+">
```

        <token type="LiteralStringDoc"/>

```
      </rule>
```
```
      <rule pattern="/\*">
```

        <token type="LiteralStringDoc"/>

```
        <push/>
```
```
      </rule>
```
```
      <rule pattern="\*/">
```

        <token type="LiteralStringDoc"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="[*/]">
```

        <token type="LiteralStringDoc"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="funcname">
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="NameFunction"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="formatted_string">
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

      <rule pattern="\\[&#39;&#34;\\nrt]|\\(?=\n)|\\x[0-7][0-9a-fA-F]|\\0|\\u\{[0-9a-fA-F]{1,6}\}|\{\{|\}\}">

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="\{[^}]*\}">
```

        <token type="LiteralStringInterpol"/>

```
      </rule>
```
```
      <rule pattern="[^\\&#34;\{\}]+">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="\\">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="string">
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

      <rule pattern="\\[&#39;&#34;\\nrt]|\\(?=\n)|\\x[0-7][0-9a-fA-F]|\\0|\\u\{[0-9a-fA-F]{1,6}\}">

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="[^\\&#34;]+">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="\\">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule pattern="#![^[\r\n].*$">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <push state="base"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="attribute[">
```
```
      <rule>
```

        <include state="attribute_common"/>

```
      </rule>
```
```
      <rule pattern="\]">
```
```
        <token type="CommentPreproc"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="[^&#34;\]\[]+">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="base">
```
```
      <rule pattern="\n">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern="//!.*?\n">
```

        <token type="LiteralStringDoc"/>

```
      </rule>
```

      <rule pattern="///(\n|[^/].*?\n)">

        <token type="LiteralStringDoc"/>

```
      </rule>
```
```
      <rule pattern="//(.*?)\n">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
      <rule pattern="/\*\*(\n|[^/*])">
```

        <token type="LiteralStringDoc"/>

```
        <push state="doccomment"/>
```
```
      </rule>
```
```
      <rule pattern="/\*!">
```

        <token type="LiteralStringDoc"/>

```
        <push state="doccomment"/>
```
```
      </rule>
```
```
      <rule pattern="/\*">
```

        <token type="CommentMultiline"/>

```
        <push state="comment"/>
```
```
      </rule>
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <push state="string"/>
```
```
      </rule>
```

      <rule pattern="\$([a-zA-Z_]\w*|\(,?|\),?|,?)">

```
        <token type="CommentPreproc"/>
```
```
      </rule>
```

      <rule pattern="(unsafe|static|extern|return|const|crate|where|while|await|trait|super|async|match|impl|else|move|loop|pub|ref|mut|for|dyn|use|box|in|if|as)\b">

```
        <token type="Keyword"/>
```
```
      </rule>
```

      <rule pattern="(abstract|override|unsized|virtual|become|typeof|final|macro|yield|priv|try|do)\b">

        <token type="KeywordReserved"/>

```
      </rule>
```
```
      <rule pattern="(true|false)\b">
```

        <token type="KeywordConstant"/>

```
      </rule>
```
```
      <rule pattern="self\b">
```

        <token type="NameBuiltinPseudo"/>

```
      </rule>
```
```
      <rule pattern="mod\b">
```
```
        <token type="Keyword"/>
```
```
        <push state="modname"/>
```
```
      </rule>
```
```
      <rule pattern="let\b">
```

        <token type="KeywordDeclaration"/>

```
      </rule>
```
```
      <rule pattern="fn\b">
```
```
        <token type="Keyword"/>
```
```
        <push state="funcname"/>
```
```
      </rule>
```

      <rule pattern="(struct|enum|type|union)\b">

```
        <token type="Keyword"/>
```
```
        <push state="typename"/>
```
```
      </rule>
```

      <rule pattern="(default)(\s+)(type|fn)\b">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
          <token type="Keyword"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(isize|usize|bool|char|u128|i128|i64|i32|i16|str|u64|u32|f32|f64|u16|i8|u8)\b">

```
        <token type="KeywordType"/>
```
```
      </rule>
```
```
      <rule pattern="[sS]elf\b">
```

        <token type="NameBuiltinPseudo"/>

```
      </rule>
```

      <rule pattern="(DoubleEndedIterator|ExactSizeIterator|IntoIterator|PartialOrd|PartialEq|ToString|Iterator|ToOwned|Default|Result|String|FnOnce|Extend|Option|FnMut|Unpin|Sized|AsRef|AsMut|Clone|None|From|Into|Sync|drop|Send|Drop|Copy|Some|Ord|Err|Box|Vec|Eq|Ok|Fn)\b">

```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
      <rule pattern="::\b">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="(?::|-&gt;)">
```
```
        <token type="Text"/>
```
```
        <push state="typename"/>
```
```
      </rule>
```

      <rule pattern="(break|continue)(\b\s*)(\&#39;[A-Za-z_]\w*)?">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```

          <token type="TextWhitespace"/>

```
          <token type="NameLabel"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="&#39;(\\[&#39;&#34;\\nrt]|\\x[0-7][0-9a-fA-F]|\\0|\\u\{[0-9a-fA-F]{1,6}\}|.)&#39;">

        <token type="LiteralStringChar"/>

```
      </rule>
```

      <rule pattern="(b)(&#39;(?:\\[&#39;&#34;\\nrt]|\\x[0-9a-fA-F]{2}|\\0|.)&#39;)">

```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralStringChar"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="0b[01_]+">
```

        <token type="LiteralNumberBin"/>

```
        <push state="number_lit"/>
```
```
      </rule>
```
```
      <rule pattern="0o[0-7_]+">
```

        <token type="LiteralNumberOct"/>

```
        <push state="number_lit"/>
```
```
      </rule>
```

      <rule pattern="0[xX][0-9a-fA-F_]+">

        <token type="LiteralNumberHex"/>

```
        <push state="number_lit"/>
```
```
      </rule>
```

      <rule pattern="[0-9][0-9_]*(\.[0-9_]+[eE][+\-]?[0-9_]+|\.[0-9_]*(?!\.)|[eE][+\-]?[0-9_]+)">

        <token type="LiteralNumberFloat"/>

```
        <push state="number_lit"/>
```
```
      </rule>
```
```
      <rule pattern="[0-9][0-9_]*">
```

        <token type="LiteralNumberInteger"/>

```
        <push state="number_lit"/>
```
```
      </rule>
```
```
      <rule pattern="(b)(&#34;)">
```
```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralString"/>

```
        </bygroups>
```
```
        <push state="bytestring"/>
```
```
      </rule>
```

      <rule pattern="(?s)(b?r)(#*)(&#34;.*?&#34;\2)">

```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralString"/>

          <token type="LiteralString"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="&#39;(static|_)">
```
```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
      <rule pattern="&#39;">
```
```
        <token type="NameAttribute"/>
```
```
        <push state="lifetime"/>
```
```
      </rule>
```
```
      <rule pattern="\.\.=?">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[{}()\[\],.;]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="[+\-*/%&amp;|&lt;&gt;^!~@=:?]">

```
        <token type="Operator"/>
```
```
      </rule>
```

      <rule pattern="\b(r#)?_?([A-Z][A-Z0-9_]*){2,}\b">

```
        <token type="NameConstant"/>
```
```
      </rule>
```

      <rule pattern="((?:e?print(?:ln)?|format(?:_args)?|panic|todo|un(?:reachable|implemented))!)(\s*)(\()(\s*)(&#34;)">

```
        <bygroups>
```

          <token type="NameFunctionMagic"/>

          <token type="TextWhitespace"/>

```
          <token type="Punctuation"/>
```

          <token type="TextWhitespace"/>

          <token type="LiteralString"/>

```
        </bygroups>
```

        <push state="formatted_string"/>

```
      </rule>
```

      <rule pattern="([a-zA-Z_]\w*!)(\s*)(\(|\[|\{)">

```
        <bygroups>
```

          <token type="NameFunctionMagic"/>

          <token type="TextWhitespace"/>

```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(r#)?[a-zA-Z_]\w*">

```
        <token type="Name"/>
```
```
      </rule>
```
```
      <rule pattern="r#[a-zA-Z_]\w*">
```
```
        <token type="Name"/>
```
```
      </rule>
```
```
      <rule pattern="#!?\[">
```
```
        <token type="CommentPreproc"/>
```
```
        <push state="attribute["/>
```
```
      </rule>
```
```
      <rule pattern="#">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="typename">
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="&amp;">
```
```
        <token type="KeywordPseudo"/>
```
```
      </rule>
```
```
      <rule pattern="&#39;(static|_)">
```
```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
      <rule pattern="&#39;">
```
```
        <token type="NameAttribute"/>
```
```
        <push state="lifetime"/>
```
```
      </rule>
```

      <rule pattern="(DoubleEndedIterator|ExactSizeIterator|IntoIterator|PartialOrd|PartialEq|ToString|Iterator|ToOwned|Default|Result|String|FnOnce|Extend|Option|FnMut|Unpin|Sized|AsRef|AsMut|Clone|None|From|Into|Sync|drop|Send|Drop|Copy|Some|Ord|Err|Box|Vec|Eq|Ok|Fn)\b">

```
        <token type="NameBuiltin"/>
```
```
      </rule>
```

      <rule pattern="(isize|usize|bool|char|u128|i128|i64|i32|i16|str|u64|u32|f32|f64|u16|i8|u8)\b">

```
        <token type="KeywordType"/>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="NameClass"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```