#11552: ScopedTypeVariables / InstanceSigs do not work in GHC 8.0 -------------------------------------+------------------------------------- Reporter: bitemyapp | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: 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 rwbarton): Not sure whether this change was intentional, but you don't need the `forall f .`, and the code compiles fine without it. See http://ghc.readthedocs.org/en/latest/glasgow_exts.html#class-and-instance- declarations. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11552#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler