panic: isInjectiveTyCon sees a TcTyCon

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

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture