#7401: Can't derive instance for Eq when datatype has no constructor, while it is trivial do do so. ---------------------------------+------------------------------------------ Reporter: jpbernardy | Owner: Type: feature request | Status: infoneeded Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.6.1 Keywords: deriving | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: GHC rejects valid program Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Changes (by igloo): * status: new => infoneeded * milestone: => 7.8.1 Comment: jpbernardy, have you got an example of why this is useful please? Did you run into this in a real program? -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7401#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler