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/usr/share/highlight/langDefs/sml.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="Standard ML"

Keywords={
  { Id=1,
    List={"abstraction", "abstype", "and", "andalso", "as", "before", "case", "datatype", "else", "end", "eqtype", "exception", "do", "fn", "fun", "functor", "handle", "if", "in", "include", "infix", "infixr", "let", "local", "nonfix", "of", "op", "open", "orelse", "overload", "raise", "rec", "sharing", "sig", "signature", "struct", "structure", "then", "type", "val", "where", "while", "with", "withtype", "o", "true", "false", "", "Bool", "String", "Int", "Real", "Word", "Char", "StringCvt", "Word8", "List", "ListPair", "Vector", "TextIO", "BinIO", "div", "mod"},
  },
  { Id=2,
    List={"bool", "string", "int", "real", "word"},
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

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

IgnoreCase=false

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

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