17 Jun
2008
17 Jun
'08
5:53 a.m.
Hi all, There is something about polymorphic tests in QuickCheck that I do not understand. If you write the simplest dummy test function tst :: a -> Bool tst _ = True and evaluate it we get
verboseCheck tst 0: () 1: () ...
How come did the polymorphic value a get instanciated to ()? Is this done via the Testable type class? Could someone please explain this to me? I'm not saying it does not make sense, but I would like to understand how it works. Being possible to change this behavior, this is, assign another "default type" whenever polymorphic types occur, would be awesome. Cheers, hugo -- www.di.uminho.pt/~hpacheco