#16127: Panic: piResultTys1 in compiler/types/Type.hs:1022:5 -------------------------------------+------------------------------------- Reporter: _deepfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.6.1 checker) | Resolution: | Keywords: 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 simonpj): I know what is happening. In `A.hs-boot` (which has `-XPolyKinds`) we have {{{ T :: forall k. k -> Type }}} Then in `B.hs-boot` we have {{{ method :: forall i x. C i => T @Type i -> x }}} When compiling `A.hs` (no `-XPolyKinds`) we get {{{ T :: Type -> Type }}} Now, when we deserialise that imported singature for `method` we construct the ill-kinded type `T @Type i`. Result, disaster. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16127#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler