#14605: Core Lint error -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: TypeInType, | DeferredTypeErrors Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #14584 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by monoidal): Similar to #14584. The essence is the code that is generated via GND for `Comonad PAIR`, which I've reduced to: {{{ {-# Language TypeApplications #-} {-# Language ImpredicativeTypes #-} import GHC.Prim (coerce) duplicate = coerce @(forall x. ()) @(forall x. x) }}} (though it's possible there are more factors causing the bug and I isolated only one of them) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14605#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler