#12811: GHC tells me to use RankNTypes when it's already enabled -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: Type of failure: Poor/confusing | Unknown/Multiple error message | Test Case: Blocked By: | Blocking: Related Tickets: #11669 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * keywords: => newcomer Comment: My suggestion would be that if `RankNTypes` is already on and a user incorrectly uses a dot as above, then the error message should say something like: {{{ Perhaps you meant to write 'forall <vars> . <body>'? }}} Not the greatest error message in the world, but still better than the status quo. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12811#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler