text: function ocaml(hljs) {
    /* missing support for heredoc-like string (OCaml 4.0.2+) */
    return {
      aliases: ['ml'],
      keywords: {
        keyword:
          'and as assert asr begin class constraint do done downto else end ' +
          'exception external for fun function functor if in include ' +
          'inherit! inherit initializer land lazy let lor lsl lsr lxor match method!|10 method ' +
          'mod module mutable new object of open! open or private rec sig struct ' +
          'then to try type val! val virtual when while with ' +
          /* camlp4 */
          'parser value',
        built_in:
          /* built-in types */
          'array bool bytes char exn|5 float int int32 int64 list lazy_t|5 nativeint|5 string unit ' +
          /* (some) types in Pervasives */
          'in_channel out_channel ref',
        literal:
          'true false'
      },
      illegal: /\/\/|>>/,
      lexemes: '[a-z_]\\w*!?',
      contains: [
        {
          className: 'literal',
          begin: '\\[(\\|\\|)?\\]|\\(\\)',
          relevance: 0
        },
        hljs.COMMENT(
          '\\(\\*',
          '\\*\\)',
          {
            contains: ['self']
          }
        ),
        { /* type variable */
          className: 'symbol',
          begin: '\'[A-Za-z_](?!\')[\\w\']*'
          /* the grammar is ambiguous on how 'a'b should be interpreted but not the compiler */
        },
        { /* polymorphic variant */
          className: 'type',
          begin: '`[A-Z][\\w\']*'
        },
        { /* module or constructor */
          className: 'type',
          begin: '\\b[A-Z][\\w\']*',
          relevance: 0
        },
        { /* don't color identifiers, but safely catch all identifiers with '*/
          begin: '[a-z_]\\w*\'[\\w\']*', relevance: 0
        },
        hljs.inherit(hljs.APOS_STRING_MODE, {className: 'string', relevance: 0}),
        hljs.inherit(hljs.QUOTE_STRING_MODE, {illegal: null}),
        {
          className: 'number',
          begin:
            '\\b(0[xX][a-fA-F0-9_]+[Lln]?|' +
            '0[oO][0-7_]+[Lln]?|' +
            '0[bB][01_]+[Lln]?|' +
            '[0-9][0-9_]*([Lln]|(\\.[0-9_]*)?([eE][-+]?[0-9_]+)?)?)',
          relevance: 0
        },
        {
          begin: /[-=]>/ // relevance booster
        }
      ]
    }
  };
  