#13343: Levity polymorphism-related GHC panic: expectJust zonkTcTyVarToVar -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Keywords: Resolution: | LevityPolymorphism 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: | -------------------------------------+------------------------------------- Comment (by goldfire): I don't have more time to look into precisely why this is getting through the cracks, but that type should be rejected by `TcValidity.check_type`. Look for the call to `forAllEscapeErr`. In short, that type is malformed because it's kind must mention `v`, which is out-of-scope. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13343#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler