#13337: GHC doesn't think a type is of kind *, despite having evidence for it -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.2 checker) | Resolution: | Keywords: 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): For your first example: this infelicity is by design, though I can't find documentation in the manual. Equality assumptions (such as your `k ~ Type`) come into scope only in an expression of that type, not later on in the same type. This design significantly eased the implementation. The second example should work -- that's a bug. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13337#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler