#11648: assertPprPanic, called at compiler/types/TyCoRep.hs:1932 -------------------------------------+------------------------------------- Reporter: thomie | Owner: goldfire Type: bug | Status: new Priority: highest | Milestone: 8.0.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Well maybe it does, but the ASSERT fails because in `getInitialKinds` because there is a CUSK we compute an initial kind for `MComp` that contains a unification variable. Now, if the ASSERT isn't there nothing actually breaks. But it's plainly wrong for `MComp` to have a kind (even temporarily) that has a free levity variable. I don't want to fix this by adding this bogus unification variable to the in-scope set; nor by disabling the ASSERT. But you could argue that since nothing is actually broken this doesn't matter, and the dragon is sleeping. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11648#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler