#15778: GHC HEAD-only panic (zonkTcTyVarToTyVar) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.8.1 Component: Compiler (Type | Version: 8.7 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * keywords: => TypeInType Comment: Marginally simpler example: {{{#!hs {-# LANGUAGE GADTs #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE TypeInType #-} module Bug where import Data.Kind data Flarble (a :: Type) where MkFlarble :: Flarble Bool data SFlarble (z :: Flarble a) where SMkFlarble :: SFlarble MkFlarble foo :: SFlarble z -> () foo s@SMkFlarble = case s of (_ :: SFlarble (MkFlarble :: Flarble probablyABadIdea)) -> () }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15778#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler