#12810: -Wredundant-constraints doesn't factor in associated type families -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: duplicate | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #11369 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Associated types are completely equivalent to top-level type families. Really the only difference is that you are prompted to provide a type instance at the same time as a class instances; and perhaps that the two "logically belong together". But there is no runtime evidence needed, and hence no class constraint is needed in function definitions. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12810#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler