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    var KEYWORDS =
      'abstract as async await become box break const continue crate do dyn ' +
      'else enum extern false final fn for if impl in let loop macro match mod ' +
      'move mut override priv pub ref return self Self static struct super ' +
      'trait true try type typeof unsafe unsized use virtual where while yield';
    var BUILTINS =
      // functions
      'drop ' +
      // types
      'i8 i16 i32 i64 i128 isize ' +
      'u8 u16 u32 u64 u128 usize ' +
      'f32 f64 ' +
      'str char bool ' +
      'Box Option Result String Vec ' +
      // traits
      'Copy Send Sized Sync Drop Fn FnMut FnOnce ToOwned Clone Debug ' +
      'PartialEq PartialOrd Eq Ord AsRef AsMut Into From Default Iterator ' +
      'Extend IntoIterator DoubleEndedIterator ExactSizeIterator ' +
      'SliceConcatExt ToString ' +
      // macros
      'assert! assert_eq! bitflags! bytes! cfg! col! concat! concat_idents! ' +
      'debug_assert! debug_assert_eq! env! panic! file! format! format_args! ' +
      'include_bin! include_str! line! local_data_key! module_path! ' +
      'option_env! print! println! select! stringify! try! unimplemented! ' +
      'unreachable! vec! write! writeln! macro_rules! assert_ne! debug_assert_ne!';
    return {
      aliases: ['rs'],
      keywords: {
        keyword:
          KEYWORDS,
        literal:
          'true false Some None Ok Err',
        built_in:
          BUILTINS
      },
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      illegal: '</',
      contains: [
        hljs.C_LINE_COMMENT_MODE,
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            { begin: '\\b(\\d[\\d_]*(\\.[0-9_]+)?([eE][+-]?[0-9_]+)?)' +
                     NUM_SUFFIX
            }
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          relevance: 0
        },
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          contains: [hljs.UNDERSCORE_TITLE_MODE]
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              className: 'meta-string',
              begin: /"/, end: /"/
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        {
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          contains: [
            hljs.inherit(hljs.UNDERSCORE_TITLE_MODE, {endsParent: true})
          ],
          illegal: '\\S'
        },
        {
          className: 'class',
          beginKeywords: 'trait enum struct union', end: '{',
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            hljs.inherit(hljs.UNDERSCORE_TITLE_MODE, {endsParent: true})
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        {
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  };