This file is indexed.

/usr/share/doc/cppo/examples/lexer.mll is in cppo 1.3.1-2.

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The actual contents of the file can be viewed below.

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(* Warning: ocamllex doesn't accept cppo directives
            within the rules section. *)
rule token = parse
    ['a'-'z']+  { `String (Lexing.lexeme lexbuf) }
{
#ifndef NOFOO
  let foo () = ()
#endif
}