#10447: DeriveFoldable rejects instances with constraints in last argument of data type -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: #8678 | Differential Revisions: -------------------------------------+------------------------------------- Comment (by dolio): Also, for instance {{{ data Refine a where RefineI :: Refine Int RefineD :: Refine Double data Foo a = Foo (Refine a) Int }}} Should a `Foldable` instance for `Foo` test the `Refine a` and fold over the `Int` if it's `RefineI`? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10447#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler