Constructors with existential quantification are rendered poorly

[RyanGlScott]

If you run Haddock on the following code:

{-# LANGUAGE ExistentialQuantification #-}
module Foo where

data Some f = forall a. Some (f a)

This is how it shows up:

Notice how the a in Some (f a) is completely unbound. This really ought to be rendered as forall a. Some (f a).

[harpocrates]

Thanks for the bug report! Should be fixed in #1003 (which I'll merge when CI is green).