#16050: Instance resolution error message unclear, because of missing kind information -------------------------------------+------------------------------------- Reporter: chessai | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): I agree. For equality mis-matches, GHC already tries not to report `T Int` does not match `T Int`, by seeing if the only differences are in the kinds. (The logic is in `TcErrors.pprWithExplicitKindsWhenMismatch`.) It would be tiresome, but not hard, to do the same for instance matching, printing the kinds if the only reason for the lack of a match is in the kinds. Any volunteers? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16050#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler