#9223: Type equality makes type variable untouchable --------------------------------------------+------------------------------ Reporter: Feuerbach | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by goldfire): I may have said this elsewhere, but if we keep the "untouchable" stuff in the error message, it would be great to include a link to more information. Untouchable variables are really subtle, and an understanding of them is necessary for a programmer to make progress here. Section 5.2 of the !OutsideIn paper is a great starting place for what should be at the other end of the link. Personally, I favor the second message above -- it has more information a programmer might use to fix the problem. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9223#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler