#15895: Unable to match instance signatures -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler | Version: 8.6.2 Resolution: | Keywords: InstanceSigs 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 goldfire): At issue here is whether the instance signature `id :: Arr a a` (excuse my Latin letters) stands alone, or should be considered in the context of the instance it's written in. Alone, there's no way to know that `a`'s kind is `Type`. But, in context, it's obvious. I think we should check an instance signature in light of this information. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15895#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler