#12131: Can't solve constraints with UndecidableSuperClasses but can infer kind (+ undesired order of kinds) -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Keywords: Resolution: | UndecidableSuperClasses, TypeInType Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11480 #12025 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * cc: ekmett (added) Comment: The code in the Description is, I think, essentially the same as that in #11523. In comment:14 of that ticket I explain why I think there is a truly infinite tower of superclasses. If there is, GHC is likely to spin, and I don't know how to prevent that. Edward claims that there isn't an infinite tower, but I think he's wrong. But I believe he probably doesn't ''intend'' there to be one. So these tickets are stalled on resolving the question of what is really intended here Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12131#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler