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/usr/share/highlight/langDefs/clean.lang is in highlight-common 3.8-2.

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-- Language definition generated by lang2to3

Description="Clean"

Keywords={
  { Id=1,
    List={"default", "definition", "derive", "case", "class", "code", "export", "from", "if", "implementation", "import", "in", "infix", "infixl", "infixr", "instance", "", "let", "module", "of", "otherwise", "special", "system", "where", "with"},
  },
  { Id=2,
    List={"Bool", "Char", "File", "Int", "Real", "World"},
  },
  { Id=3,
    List={"True", "False"},
  },
}

Strings={
  Delimiter=[["]],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[//]] },
  },
  { Block=true,
    Nested=true,
    Delimiter= { [[\/\*]],[[\*\/]],}
  }
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|\<|\>|\!|\=|\/|\*|\%|\+|\-|\.|\'|\#|\@|\$|\\]]