#12468: GADTs don't refine hole types -------------------------------------+------------------------------------- Reporter: benjamin.hodgson | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #11325 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): On second thoughts, I don't think I'd fully realised that there was a type signature to guide the type checker. Yes, it probably does make sense to "normalise" the hole with all the "givens". And it's very easy to do, a 2-line change. Patch coming -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12468#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler