Your link lightly addresses one of my questions about using DCGs for parsing. How hard is it to get a sensible error message out of a DCG parser? I've basical

Your link lightly addresses one of my questions about using DCGs for parsing. How hard is it to get a sensible error message out of a DCG parser? I've basically written off LALR parsers because getting a reasonable error message out of them is about as much fun as repeatedly poking yourself in the eye with a sharp stick. Good old recursive decent using precedence climbing for expressions seems to be more maintainable in the long run for production parsers.