#14243: GHC doesn't add constraint when deriving -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: 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 Iceland_jack): I don't remember if GHC rejects constraints with type families / that require `FlexibleContexts`, but here it infers the missing constraint -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14243#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler