#14887: Explicitly quantifying a kind variable causes a telescope to fail to kind- check -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler (Type | Version: 8.2.2 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): I think the best way to get good error messages here is to bring both implicit and explicit variables into scope all at once, and then have `setImplicationStatus` report errors involving both explicit and implicit variables. See `Note [Keeping scoped variables in order: Explicit]` in !TcHsType for the general idea; here, I'm proposing this plan to cover implicit variables, too. One wrinkle: datatypes go via a different mechanism, in `kcLHsQTyVars` and friends. Question: could we unify these mechanisms? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14887#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler