#8913: either bug or confusing error message mixing PolyKinds and TypeFamilies -------------------------------------+------------------------------------- Reporter: ghorn | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.8.1-rc2 checker) | Keywords: PolyKinds, Resolution: | TypeFamilies Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"c89c57e3b72a8f3de9f35e1bd6e0f70d2b18a941/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="c89c57e3b72a8f3de9f35e1bd6e0f70d2b18a941" For equalities with incompatible kinds, new IrredCan goes in the inert set, not work list This change makes the code for canIrred markedly simpler (and more efficient) See Note [Equalities with incompatible kinds]. I don't think there was really a bug here, but I came across it when fixing Trac #8913 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8913#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler