#11700: pattern match bug -------------------------------------+------------------------------------- Reporter: TobyGoodwin | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: | https://github.com/TobyGoodwin/odd- | ghc-pattern-bug Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by TobyGoodwin): Fantastic work thomie! Thanks so much for this. That appears to be standalone to me, no extra packages needed. Copy and paste that code into `T11700.hs`, run `ghc T11700.hs` and you get the bogus error. Works for me with ghc-7.10.3 and no `~/.ghc` or `~/.cabal`. And as thomie says, removing the `TypeFamilies` extension makes the problem go away. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11700#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler