#13068: GHC should not allow modules to define instances of abstract type classes -------------------------------------+------------------------------------- Reporter: ezyang | Owner: (none) Type: bug | Status: patch Priority: low | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: backpack Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3254 Wiki Page: | -------------------------------------+------------------------------------- Changes (by ezyang): * status: new => patch * differential: => Phab:D3254 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13068#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler