#13092: family instance consistency checks are too pessimistic -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: rwbarton Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Replying to [comment:5 simonpj]:
Actually there is ''some'' justification for the status quo.
... except that, regardless of Reid's excellent example in comment:6, having `F Int = Bool` and `F Int = Char` in scope means that we can write a proof of `Bool ~ Char` in Core. Continuing the status quo means that Core Lint is much less useful. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13092#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler