
#15347: QuantifiedConstraints: Implication constraints with type families don't work -------------------------------------+------------------------------------- Reporter: aaronvargo | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.5 checker) | Keywords: Resolution: | QuantifiedConstraints 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 goldfire): OK. I see how this is different than #14860. But I still claim that GHC should not do this rewriting, because having a variable in a quantified constraint head casts a longer shadow than having a type family. And it's all about that shadow. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15347#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler