#13959: substTyVar's definition is highly dubious -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: 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 goldfire): comment:3 is easy to diagnose: note that the stack includes `substCoWithUnchecked`, but the "uncheckedness" doesn't propagate. Not sure what the best way to fix this is, but the underlying problem is not ours. comment:2 is as you describe: the `inst_tvs` here do ''not'' need to contain the kinds. But the `InScopeSet` surely does! Use `closeOverKinds`. This is a latent bug, as I expected. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13959#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler