#12989: ($) can have a more general type -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Keywords: Resolution: | LevityPolymorphism Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by andrewthad): One drawback of giving `($)` the more general type is than `(&)` can no longer be made symmetric with it. That is, we have no way of writing: {{{ (&) :: forall (r1 :: RuntimeRep) (r2 :: RuntimeRep) (a :: TYPE r1) (b :: TYPE r2). a -> (a -> b) -> b }}} This probably isn't that big of a deal, but it is a little weird. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12989#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler