#14860: QuantifiedConstraints: Can't quantify constraint involving type family -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.5 checker) | Keywords: Resolution: | QuantifiedConstraints wipT2893 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 simonpj):
there shouldn't be anything problematic about allowing them in quantified constraints!
But I think there absolutely IS something problematic! At least I have no idea how to specify or implement a system that allows them. Maybe I'm just being dense. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14860#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler