#16315: Pattern synonym implicit existential quantification -------------------------------------+------------------------------------- Reporter: int-index | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Resolution: | Keywords: 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): You have a red herring in your soup. The following snippet is also accepted: {{{#!hs pattern P :: forall. () => forall k (a :: k). Proxy a -> T pattern P x = MkT (x :: Proxy (b :: j)) }}} There's no scoping going on here, just the fact that these type variables are unconstrained. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16315#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler