#11052: Standalone derived Typeable instance for promoted lists is not found -------------------------------------+------------------------------------- Reporter: liamoc | Owner: 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 goldfire): * priority: normal => high * milestone: => 8.0.1 Comment: (Written concurrently with comment:2) This is actually expected behavior, but perhaps shouldn't be. The problem is that, at your call sites of `typeRep`, GHC doesn't know what ''kinds'' you want to specialize `'[]` and `'(:)` to. We can't have type representations of poly-kinded things (for various good reasons that would take a bit of academic research to sort out), so compilation fails. But we sure can improve the error message. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11052#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler