#12782: Type inference shows (Num (a -> a), Num a) -------------------------------------+------------------------------------- Reporter: ciupakabra | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: invalid | Keywords: Operating System: Linux | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by nomeata): * status: new => closed * resolution: => invalid Comment:
Num (a -> a) is never going to be a number.
It could be. Someone just has to give an `instance Num (a -> b)`. The compiler cannot assume that no such instance will ever be around. It seems to me that the compiler behaviour is ok and desired as is. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12782#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler