#9858: Typeable instances should be kind-aware -------------------------------------+------------------------------------- Reporter: dreixel | Owner: Type: bug | Status: merge Priority: highest | Milestone: 7.10.2 Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | typecheck/should_fail/T9858a, | should_run/T9858b | Blocking: | Differential Revisions: Phab:D652 -------------------------------------+------------------------------------- Comment (by diatchki): This should be fixed in HEAD now. Please give it a whirl, and let me know if you run into any more problems. The implementation should be what Richard discribed: * Constraints are OK * Impredicative types are not OK (not even things like `Eq Int => Int`) * Constraint and normal tuples should have different representations at all arities. A side-note: I couldn't figure out how to write the type constructor `(,) :: Constraint -> Constraint -> Constraint`, so I had to get creative with the testing. Is that intentional? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9858#comment:94 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler