#8968: Pattern synonyms and GADTs ----------------------------------------------+---------------------------- Reporter: kosmikus | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: Resolution: | 7.8.1-rc2 Operating System: Unknown/Multiple | Keywords: Type of failure: GHC rejects valid program | Architecture: Test Case: | Unknown/Multiple Blocking: | Difficulty: Unknown | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Comment (by kosmikus): FWIW, I was assuming the problem that SPJ describes is the underlying problem here. I don't know the implementation, but I find it entirely reasonable that pattern synonyms for GADTs will in general require type signatures in order to disambiguate between incomparable types. That's why I started talking about type signatures for pattern synonyms in the first place. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8968#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler