#11142: Type-level skolem capture leads to core lint error -------------------------------------+------------------------------------- Reporter: goldfire | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.0.1 Component: Compiler (Type | Version: 7.10.2 checker) | 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: | -------------------------------------+------------------------------------- Changes (by simonpj): * cc: ekmett (added) Comment: I don't think I even knew that! The old behaviour is terribly inconsistent; type variables are quantified at top level, while kind variables are quantified locally. It is not at all easy to resurrect the old behaviour: the new data type for `HsType` simply can't express it, by design. All the implicit binders are in `HsImplicitBinders` which are at the top. This is only going to be notice by people who using higher-rank functions where the nested higher-rank type is itself kind-polymorphic. I don't think there are many such people. I'm strongly inclined not to worry. I'm copying Edward who is the person on the planet most likely to have explored this particular corner. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11142#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler