#15474: Error message mentions Any -------------------------------------+------------------------------------- Reporter: monoidal | Owner: (none) Type: bug | Status: new Priority: low | Milestone: 8.8.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Poor/confusing | Unknown/Multiple error message | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
So why doesn't something like that happen for Forall?
Ah, I think it's because * The kind of `Forall`'s RHS is just `Type` * And we do kind-generalise that kind; it has no free kind variables, so no kind-generalisation actually happens. And in any case the decl {{{ type Forall k = forall (t :: k). Proxy @k t }}} gives `Forall` the ambiguous kind `Forall :: forall k. Type`, which will do no one any good. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15474#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler