#14859: Allow explicit impredicativity -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: | ImpredicativeTypes 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 RyanGlScott): Should we allow visible application of polytypes //carte blanche//? What happens when visible kind application rolls in and we can write this? {{{#!hs hm :: forall (f :: forall a. a -> a). Proxy @(forall a. a -> a) f hm = Proxy }}} The type `Proxy @(forall a. a -> a) f` seems to have a strongly impredicative flavor, but this is only a hunch. What do others think? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14859#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler