#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 simonpj): Principle: implicitly-quantified variables always precede explicitly- quantified variables in a type or kind. So `Foo1` and `Foo2` in the OP are ''not'' equivalent. * In `Foo1` the implicitly-quantified variables are `k` and `a::k`; and GHC can put them in that order. * But in `Foo2` the implicitly quantified variable is only `a::k` and that can't come first. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14887#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler