#8984: Improve output of failed GeneralizedNewtypeDeriving coercion due to type roles --------------------------------------------+------------------------------ Reporter: haasn | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by haasn): More specifically, the exact type that causes a problem is ‘WrappedSchoenfinkel cat’ and ‘cat’ not being nominally equal. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8984#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler