#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): The point that I'm trying to make is that we're gradually transitioning instance declarations over to recognizing wildcard types, so this is a necessary first step to take in that direction. Having recognized this, we need to `Wc`-ify the `LHsSigType`s used in instance declaration AST types. Having done so, we will get the //immediate// benefit of having better error messages when named wildcards are used, and we will get the knock-on benefit of making it easier for named wildcard to be properly integrated later. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13415#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler