#14861: QuantifiedConstraints: Can't use forall'd variable in context -------------------------------------+------------------------------------- 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):
I would have expected the (forall p. c p => Foldable' f) quantified constraint to kick in there.
Can you say why? We are trying to solve `c beta`. How does the quantified constraint help with that? It tells how to solve `Foldable` constraints. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14861#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler