#12589: GHC panic with defer-typed-holes -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): This program: {{{#!hs {-# LANGUAGE ConstraintKinds #-} {-# LANGUAGE RankNTypes #-} {-# LANGUAGE TypeApplications #-} import Data.Proxy hcpure :: proxy c -> (forall a. c a => f a) -> h f xs hcpure _ _ = undefined a = minBound & hcpure (Proxy @Bounded) }}} produces that GHC panic with GHC 8.0.1, but not with GHC 8.0.2 or HEAD. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12589#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler