#13731: DeriveFunctor and friends don't understand type families -------------------------------------+------------------------------------- Reporter: spacekitteh | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1-rc2 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): Replying to [comment:4 simonpj]:
If you reduce the arity of `ExtensionType1 the `deriving` clause works fine (as it should)
Ah, nothing to do with injective type families -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13731#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler