#8678: Derivin `Functor` complains about existential type -------------------------------------+------------------------------------ Reporter: heisenbug | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by heisenbug): Replying to [comment:1 carter]:
where does the variable {{{n}}} get introduced in {{{Standard :: a -> NonStandard (S n) a}}} ? That seems existential
No, it is a variable that appears in the type of the result, so it is not existential. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8678#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler