#10873: Bad error message for incorrect pattern synonym signature -------------------------------------+------------------------------------- Reporter: mpickering | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): The error should now be triggered by switching around the constraints. {{{ {-# LANGUAGE PatternSynonyms #-} pattern Pat :: () => Show a => a -> Maybe a pattern Pat a = Just a }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10873#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler