This file is indexed.

/usr/share/highlight/langDefs/mercury.lang is in highlight-common 3.9-1+deb7u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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-- FIXME omitted definition of $KEYWORDS(KWA)
-- Language definition generated by lang2to3

Description="Mercury"

Keywords={
  { Id=1,
    List={"is", "and", "or", "func", "impure", "", "", "pred", "", "semipure", "not", "when", "then", "if", "else", "where", "", "", "all", "arbitrary", "promise_equivalent_solutions", "promise_equivalent_solution_sets", "promise_exclusive", "promise_exclusive_exhaustive", "promise_exhaustive", "promise_impure", "", "promise_impure_implicit", "promise_pure", "promise_pure_implicit", "promise_semipure", "promise_semipure_implicit", "some", "ype", "solver", "", "", "end_module", "import_module", "include_module", "initialise", "initialize", "finalise", "finalize", "inst", "instance", "mode", "module", "pragma", "", "", "promise", "", "rule", "typeclass", "use_module", "interface", "implementation", "det"},
  }, 
  {
   Id=2,
   List={"div", "mod", "rem"},
  },
  { Id=3,
    Regex=[[[A-Z]\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\\\?'"])