#9953: Pattern synonyms don't work with GADTs -------------------------------------+------------------------------------- Reporter: simonpj | Owner: cactus Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler (Type | Version: 7.10.1-rc1 checker) | Keywords: Resolution: | PatternSynonyms Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by simonpj): Correct. The original ticket description says "Without fixing it, GADT- style pattern signatures are all but useless", and the conclusion of the discussion is that we can't use GADT-style pattern signatures! So yes, all that remains is to review the user manual to ensure that it makes this point explicit. I don't think we need any implementation changes. (Contrary to my initial supposition.) Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9953#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler