#9612: Use functional dependencies to give more specific error messages -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.3 Component: Compiler | Keywords: (Type checker) | Architecture: Unknown/Multiple Resolution: | Difficulty: Unknown Operating System: | Blocked By: Unknown/Multiple | Related Tickets: Type of failure: | None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by rwbarton): Oh, I meant for `tell` to be the one from mtl `Control.Monad.Writer`, sorry. {{{ class (Monoid w, Monad m) => MonadWriter w m | m -> w where writer :: (a,w) -> m a tell :: w -> m () listen :: m a -> m (a, w) pass :: m (a, w -> w) -> m a }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9612#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler