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

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The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="Icon"

Keywords={
  { Id=1,
    List={"by", "case", "", "create", "default", "do", "else", "every", "if", "initial", "next", "of", "repeat", "then", "to", "until", "while", "break",
          "end", "fail", "global", "invocable", "link", "local", "procedure", "record", "return", "static", "suspend"},
  },
  { Id=2,
    List={"co-expression", "cset", "tfile", "integer", "list", "null", "real", "set", "string", "table", "window"},
  },
  { Id=3,
    Regex=[[\&\w+]]
  },
  { Id=3,
    Regex=[[\$\w+]]
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

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

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[#]] },
  },
}

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

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