#15471: Polymorphism, typed splices and type inference don't mix -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Template Haskell | Version: 8.4.3 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 simonpj): Yes, GHC infers `test_foo2 :: forall a. Num a => Q (TExp (a->a))`. You like that -- good. But now what would you ''expect'' to happen here? {{{ qux = $$(test_foo2) }}} We must pass a dictionary, so we probably default to `Integer`. And that's precisely what is happening in the Description, except that there we default to `Any` because we don't have to satisfy `Num`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15471#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler