#14938: Pattern matching on GADT does not refine type family parameters -------------------------------------+------------------------------------- Reporter: kcsongor | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.2.2 checker) | Keywords: GADTs, Resolution: | TypeFamilies 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 RyanGlScott): I'd be OK with requiring the user write `R x x Refl`. But in that case, the error message is pretty darn misleading. It's complaining about `Refl`, but the real error is due to the fact that `x` and `y` are distinct, right? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14938#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler