#11560: panic: isInjectiveTyCon sees a TcTyCon -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 (Type checker) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I typed this into ghci and it panicked. Not sure whether the declaration is really valid anyways, but ghci shouldn't panic on it. {{{ rwbarton@morphism:~/ghc-newest$ ./inplace/bin/ghc-stage2 --interactive GHCi, version 8.1.20160201: http://www.haskell.org/ghc/ :? for help Prelude> :set -XTypeFamilies -XTypeInType Prelude> :m +Data.Kind Prelude Data.Kind> type family T (l :: *) (k :: l) :: * where { T * Int = * } ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.1.20160201 for x86_64-unknown-linux): isInjectiveTyCon sees a TcTyCon T Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11560 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler