#5863: Deriving Typeable for data families ---------------------------------+------------------------------------------ Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.6.2 Component: Compiler | Version: 7.4.1 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by simonpj): You've convinced me to be dubious about #7897 (see comment added). So yes, let's disable `deriving Typeable` for family instances, with a message saying that you need to derive it for the family itself. And some words for the user manual would be good. Thanks. Simon -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5863#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler