#13430: Can't scope type variables when pattern matching on GADTs -------------------------------------+------------------------------------- Reporter: crockeea | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by crockeea):
the type signature is matched before we get to the A part
That may be the case, but it's quite strange that I wrote `A :: Foo Bool` in the GADT definition, but I can't write `A :: Foo Bool` in the pattern. `A` certainly does have that type. I think the notation is natural enough that it should work. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13430#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler