#15590: Existentials in newtypes -------------------------------------+------------------------------------- Reporter: NioBium | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Please allow existential quantification of phantom type arguments in newtypes. {{{ type role A nominal representational phantom -- Or inferred roles. newtype B a b where B :: A a b c -> B a b }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15590 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler