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/usr/share/highlight/langDefs/felix.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="Felix"

Keywords={
  { Id=1,
    List={"all", "and", "as", "body", "call", "case", "class", "code", "const", "define", "elif", "else", "endif", "endmatch", "except", "export", "fork", "fun", "function", "functor", "goto", "header", "if", "in", "inf", "interface", "lambda", "let", "match", "module", "NaN", "", "not", "of", "open", "or", "proc", "procedure", "raise", "read", "regexp", "regmatch", "return", "struct", "then", "to", "todo", "type", "typedef", "union", "use", "val", "var", "when", "with", "header", "body", "code", "open", "", "use", "endl", "print", "include", "true", "false", "not", "and", "or", "lnot", "land", "lor", "pow", "eol"},
  },
  { Id=2,
    List={"tiny", "short", "int", "long", "vlong", "utiny", "ushort", "uint", "ulong", "uvlong", "int8", "int16", "int32", "int64", "uint8", "uint16", "uint32", "uint64", "float", "double", "ldouble", "", "float32", "float64", "float80", "char", "wchar", "uchar", "string", "wstring", "ustring", "void", "unit", "bool", "any", "address", "byte"},
  },
}

Strings={
  Delimiter=[["""|'''|"|']],
  RawPrefix="r",
}

IgnoreCase=false

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

PreProcessor={
  Prefix=[[#]],
}

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

--FIXME no default escchar param: regex(\\\d{3}|\\x[[:xdigit:]]{2}|\\[ntvbrfa\\\?'"])