#9573: Add warning for invalid digits in integer literals -------------------------------------+------------------------------------- Reporter: vlopez | Owner: vlopez Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.9 (Parser) | Keywords: parsing, integer, Resolution: | octal, binary, hexadecimal, Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Difficult (2-5 Type of failure: | days) None/Unknown | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by andreas.abel): I think a parse *error* would be more appropriate (and useful) than a warning. I consider it as a bug rather than a feature that the following parses: {{{ test h = (+)92837492837h }}} Whitespace isn't that expensive anymore, and even cheaper on the black market ;-), so this "feature" does not seem worth preserving. The moral: number literals should have to be terminated by one of the following: whitespace, punctuation (including parenthesis), operators etc, but not just by an alphabetic character. Maybe one can first parse a number literal as it was an identifier (i.e., allow leading numeric characters in identifiers), and then postprocess identifiers that start with a numeric character as number literals, giving parse errors if they do not make sense. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9573#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler