(function (Prism) {
  var multilineComment = /\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|<self>)*\*\//.source;
  for (var i = 0; i < 2; i++) {
    // support 4 levels of nested comments
    multilineComment = multilineComment.replace(/<self>/g, function () {
      return multilineComment;
    });
  }
  multilineComment = multilineComment.replace(/<self>/g, function () {
    return /[^\s\S]/.source;
  });

  Prism.languages.rust = {
    comment: [
      {
        pattern: RegExp(/(^|[^\\])/.source + multilineComment),
        lookbehind: true,
        greedy: true,
      },
      {
        pattern: /(^|[^\\:])\/\/.*/,
        lookbehind: true,
        greedy: true,
      },
    ],
    string: {
      pattern: /b?"(?:\\[\s\S]|[^\\"])*"|b?r(#*)"(?:[^"]|"(?!\1))*"\1/,
      greedy: true,
    },
    char: {
      pattern:
        /b?'(?:\\(?:x[0-7][\da-fA-F]|u\{(?:[\da-fA-F]_*){1,6}\}|.)|[^\\\r\n\t'])'/,
      greedy: true,
    },
    attribute: {
      pattern: /#!?\[(?:[^\[\]"]|"(?:\\[\s\S]|[^\\"])*")*\]/,
      greedy: true,
      alias: 'attr-name',
      inside: {
        string: null, // see below
      },
    },

    // Closure params should not be confused with bitwise OR |
    'closure-params': {
      pattern: /([=(,:]\s*|\bmove\s*)\|[^|]*\||\|[^|]*\|(?=\s*(?:\{|->))/,
      lookbehind: true,
      greedy: true,
      inside: {
        'closure-punctuation': {
          pattern: /^\||\|$/,
          alias: 'punctuation',
        },
        rest: null, // see below
      },
    },

    'lifetime-annotation': {
      pattern: /'\w+/,
      alias: 'symbol',
    },

    'fragment-specifier': {
      pattern: /(\$\w+:)[a-z]+/,
      lookbehind: true,
      alias: 'punctuation',
    },
    variable: /\$\w+/,

    'function-definition': {
      pattern: /(\bfn\s+)\w+/,
      lookbehind: true,
      alias: 'function',
    },
    'type-definition': {
      pattern: /(\b(?:enum|struct|trait|type|union)\s+)\w+/,
      lookbehind: true,
      alias: 'class-name',
    },
    'module-declaration': [
      {
        pattern: /(\b(?:crate|mod)\s+)[a-z][a-z_\d]*/,
        lookbehind: true,
        alias: 'namespace',
      },
      {
        pattern:
          /(\b(?:crate|self|super)\s*)::\s*[a-z][a-z_\d]*\b(?:\s*::(?:\s*[a-z][a-z_\d]*\s*::)*)?/,
        lookbehind: true,
        alias: 'namespace',
        inside: {
          punctuation: /::/,
        },
      },
    ],
    keyword: [
      // https://github.com/rust-lang/reference/blob/master/src/keywords.md
      /\b(?:Self|abstract|as|async|await|become|box|break|const|continue|crate|do|dyn|else|enum|extern|final|fn|for|if|impl|in|let|loop|macro|match|mod|move|mut|override|priv|pub|ref|return|self|static|struct|super|trait|try|type|typeof|union|unsafe|unsized|use|virtual|where|while|yield)\b/,
      // primitives and str
      // https://doc.rust-lang.org/stable/rust-by-example/primitives.html
      /\b(?:bool|char|f(?:32|64)|[ui](?:8|16|32|64|128|size)|str)\b/,
    ],

    // functions can technically start with an upper-case letter, but this will introduce a lot of false positives
    // and Rust's naming conventions recommend snake_case anyway.
    // https://doc.rust-lang.org/1.0.0/style/style/naming/README.html
    function: /\b[a-z_]\w*(?=\s*(?:::\s*<|\())/,
    macro: {
      pattern: /\b\w+!/,
      alias: 'property',
    },
    constant: /\b[A-Z_][A-Z_\d]+\b/,
    'class-name': /\b[A-Z]\w*\b/,

    namespace: {
      pattern: /(?:\b[a-z][a-z_\d]*\s*::\s*)*\b[a-z][a-z_\d]*\s*::(?!\s*<)/,
      inside: {
        punctuation: /::/,
      },
    },

    // Hex, oct, bin, dec numbers with visual separators and type suffix
    number:
      /\b(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0o[0-7](?:_?[0-7])*|0b[01](?:_?[01])*|(?:(?:\d(?:_?\d)*)?\.)?\d(?:_?\d)*(?:[Ee][+-]?\d+)?)(?:_?(?:f32|f64|[iu](?:8|16|32|64|size)?))?\b/,
    boolean: /\b(?:false|true)\b/,
    punctuation: /->|\.\.=|\.{1,3}|::|[{}[\];(),:]/,
    operator: /[-+*\/%!^]=?|=[=>]?|&[&=]?|\|[|=]?|<<?=?|>>?=?|[@?]/,
  };

  Prism.languages.rust['closure-params'].inside.rest = Prism.languages.rust;
  Prism.languages.rust['attribute'].inside['string'] =
    Prism.languages.rust['string'];
})(Prism);