#12163: Surprising error message when deriving Functor for a GADT -------------------------------------+------------------------------------- Reporter: benjamin.hodgson | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 Type of failure: Incorrect | (amd64) warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"cc92a446d6932cf06364529e71c866289088c59a/ghc" cc92a44/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="cc92a446d6932cf06364529e71c866289088c59a" Improve error message in deriving( Functor ) Fixes Trac #12163. Pretty simple. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12163#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler