#10195: GHC forgets constraints when matching on GADTs -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by crockeea): goldfire: In what sense does the `Bar m m'` constraint overlap with the instance? As far as I was aware, it would be impossible to have "overlapping" instances with just a single instance. This is likely just a misunderstanding of the term on my part. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10195#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler