#8567: Poor error message when GeneralizedNewtypeDeriving fails -------------------------------------+------------------------------------ Reporter: goldfire | Owner: nomeata Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Changes (by nomeata): * owner: => nomeata Comment: In discussion with SPJ, we thought about how we can catch missing instances already in the code for deriving, at least for non-standalone- deriving. I’ll work on that, and on making the error message a bit nicer. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8567#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler