#13363: Wildcarn patterns and COMPLETE sets can lead to misleading redundant pattern-match warnings -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: | PatternSynonyms, | PatternMatchWarnings Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): I think this is a bug because the match is not "redundant" as removing it will change the semantics of the function. Similarly if you write {{{ f T = 1 f F = 0 f _ = 3 }}} then removing the F case leaves a complete definition but the correct thing to do is to remove the redundant wildcard clause. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13363#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler