#11669: Incorrectly suggests RankNTypes for ill-formed type "forall a. Eq a. Int" -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 (Parser) | Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #3155 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by thomie): * keywords: => newcomer * failure: None/Unknown => Incorrect warning at compile-time * component: Compiler => Compiler (Parser) * related: => #3155 Comment: This could be easy to fix: * Suggest `ExplicitForAll` instead of `RankNTypes`. * Only suggest `ExplicitForAll` if `ExplicitForAll` isn't set yet. For a newcomer: the code is `compiler/parser/Parser.y`. Search for `RankNTypes`, and see the function `hintExplicitForall` for inspiration. Don't forget a test! The last real change to this code was in 6c06fdc7ad20682f0f52b5a78e5e3487a2ed047b (#3155). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11669#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler