but I assume the same code is used to actually generate the instances in

#7401: Can't derive instance for Eq when datatype has no constructor, while it is trivial do do so. -------------------------------------+------------------------------------- Reporter: jpbernardy | Owner: osa1 Type: feature request | Status: new Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: 7.6.1 Resolution: | Keywords: deriving, Operating System: Unknown/Multiple | newcomer Type of failure: GHC rejects | Architecture: valid program | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: Phab:D978 -------------------------------------+------------------------------------- Comment (by osa1): those two cases, right? Right, the whole point is to make those work the same. Either way(e.g. empty case or error) works for me. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7401#comment:37 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler