#12670: Representation polymorphism validity check is too strict -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: typeable Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Replying to [comment:13 simonpj]:
Let's see what Richard has to say.
I say "yes". I also say that your `Fun` is quite wrong. I prefer this one: {{{#!hs pattern Fun :: forall k (a_to_b :: k). () => forall r r' (a :: TYPE r) (b :: TYPE r'). (k ~ Type, a_to_b ~ (a -> b)) => TypeRep a -> TypeRep b -> TypeRep a_to_b }}} But otherwise I agree with your conclusions. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12670#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler