#11450: Associated types at wrong type in instance -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: high | Milestone: 8.0.1 Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11449, #11451 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by bgamari: @@ -2,1 +2,1 @@ - {{{ + {{{#!hs New description: Consider {{{#!hs class C x where type T x instance C (Either a b) where type T (Either b a) = b -> a }}} This is bogus, because the equation for `T` has the parameters to `Either` reversed. But GHC 8.0 RC1 (and master) allow it. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11450#comment:21 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler