Am 02.09.2014 um 09:25 schrieb Vivian McPhail:

> I've tried using pointers (Ptr a) but (DC a) and (Gtk.DrawWindow) aren't
> members of `Storable`.

I don't think there is any restriction to the type of the pointer 
target. Does GHC expect, that DC is Storable when you use an argument of 
type Ptr (DC a)?

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