#9778: Namespace collision detection for promoted types -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.3 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by crockeea): It seems there are a couple of options: 1. Solve this problem by making DataKinds always promote to `'S`, and never to `S`. I'm sure this was long-debated when DataKinds was introduced, and is therefore unlikely to happen. 2. Add a very mild message anytime there is a type error about a type that shares a name with a promoted constructor, something like "Be aware that S could refer to the constructor promoted from blah" Either one is an improvement over the current black-holing of promoted types when a non-promoted type is in scope. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9778#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler