#9790: Produce coercion rules for derived Functor instances -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.9 Component: Compiler | Keywords: coercion Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:3 goldfire]:
I do think your idea is sound as long as the derived `Functor` instance has no constraints.
That's what I was trying to get at with the bit about not depending on non-derived `Functor` instances. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9790#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler