#10577: Use empty cases where appropriate when deriving instances for empty types -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by osa1): One thing to note: We have two ways to derive instances, using `deriving (..)` syntax and StandaloneDeriving. If we want to make changes described here and also keep this two methods of instance deriving consistent with each other(currently they're not), it means breaking change. IMHO, StandaloneDeriving and `deriving (..)` should work the same, so we should either do this breaking change or merge https://phabricator.haskell.org/D978. Also, I'm not sure how relevant it is, but `Data.Void.Void`s methods are currently not forcing the arguments. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10577#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler