#13328: Foldable, Functor, and Traversable deriving handle phantom types badly -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: deriving-perf Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): I do agree that your proposed definition is probably the better one. I only ask that we point out this change in strictness in the users' guide (and probably the migration guide for whatever GHC release this makes it into) so that users aren't too surprised. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13328#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler