17 Jun
2008
17 Jun
'08
6:05 a.m.
2008/6/17 Hugo Pacheco
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?
I haven't got something here to check with, but from the formatting it looks like every odd line is a randomly-chosen boolean value, and the following line is the result? It might be just printing the result value of IO (). Maybe try a more complete test to see how that looks? Cheers, D -- Dougal Stanton dougal@dougalstanton.net // http://www.dougalstanton.net