#13651: Invalid redundant pattern matches with -XTypeFamilyDependencies -------------------------------------+------------------------------------- Reporter: crockeea | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: | InjectiveFamilies 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 RyanGlScott): As it turns out, that's not the full story. The first commit in which the program in this ticket compiled without warnings was eb55ec2941239dee05afc6be818b129efe51660e (Refactor functional dependencies a bit). Commit adb565aa74582969bbcc3b411d6d518b1c76c3cf, on the other hand, did squash needless pattern-match warnings in some other, similar programs, such as this one: {{{#!hs {-# LANGUAGE TypeFamilies #-} module Bug2 where foo :: Int ~ Bool => a -> a foo x = x }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13651#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler