#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 goldfire): I could rally behind calling `-fwarn-unticked-promoted-constructors` the solution to this problem. I'm -0.5 on including text in any error message about `S` the possibility that the user means `'S` -- just seems like noise to me. Note that I've changed the name of the warning flag, as `implicit` conjures up the wrong associations for me. It's interesting to note that I frequently use ticks everywhere in presentations about !DataKinds stuff. (I leave off the ticks in my own code, though.) I think requiring the ticks makes for a better reader experience for folks who are not deep into this. I also think that the ticks should be allowed (but not required) in kinds. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9778#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler