#13415: Instance declarations don't recognize named wildcards -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.4.1 Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Poor/confusing | Unknown/Multiple error message | Test Case: Blocked By: | Blocking: Related Tickets: #13324 | Differential Rev(s): Phab:D3332 Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Replying to [comment:2 simonpj]:
If #13324 doesn't fly, this change is just an unnecessary complication.
I don't agree. This ticket demonstrates a somewhat orthogonal bug: the error messages for using named wildcards in instance declarations are wildly misleading! We should be able to fix this, even if it takes longer to make `PartialTypeSignatures` work for arbitrary instances with wildcards. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13415#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler