I currently retrieve location like this during parser errors:

   let rhs_loc n = (Parsing.rhs_start_pos n, Parsing.rhs_end_pos n)

I then report it like this:

   let syntax_error s num =
     parser_error s (rhs_loc num)

In my grammar I report errors like this:

   | INPUT COLON input_decs error { syntax_error "Missing semicolon" 4 }

I don't do anything special in the lexer to adjust lexeme positions.

How do I rewrite my error reporting for Menhir?

	Thanks, Joel

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