#11480: UndecidableSuperClasses causes the compiler to spin with UndecidableInstances -------------------------------------+------------------------------------- Reporter: ekmett | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1-rc1 checker) | Keywords: PolyKinds, Resolution: | UndecidableSuperClasses Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: #10318 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * priority: high => normal * milestone: 8.0.1 => Comment: comment:2 does indeed suggest a special case. I'll implement that. Your original example seems to work in HEAD. I'll try the current 8.0 branch. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11480#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler