#13998: Default Signature messes up arity of type constructor -------------------------------------+------------------------------------- Reporter: andrewthad | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Replying to [comment:7 simonpj]:
But the `classTyCon` has everything. The `classTyVars` are redundant, just there for convenience.
Oops, I overlooked that. Also, please ignore the noise in the latter part of comment:6 - the type signature wasn't pretty-printing the way I expected because I neglected to enable `-fprint-explicit-foralls`. If you do, you'll get: {{{ λ> :set -fprint-explicit-foralls λ> :type +v eqForallPoly eqForallPoly :: forall {k} (f :: k -> *). EqForallPoly f => forall (a :: k) (b :: k). f a -> f b -> Bool }}} as expected. So that is working as expected. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13998#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler