#12144: GHC panic when using DeriveAnyClass with functor-like class and datatype with a type variable in a contravariant position -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Type: bug | Status: patch Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Generics Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: #5462, #7346, | Differential Rev(s): Phab:D2961 #12423 | Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: new => patch * differential: => Phab:D2961 Comment: A WIP attempt at fixing this is at ​Phab:D2961. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12144#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler