QuickCheck properties for IntSet

[Henning Thielemann]

On Mon, 3 Dec 2007, David Benbennick wrote:

> On 12/3/07, Don Stewart <dons at galois.com> wrote:
> > > I wish I could use QuickCheck to write an actual unit test: that is,
> > > an executable program that returns 0 on success, and non-zero on
> > > failure.  Then we could put these properties in the tests/ directory,
> > > and have them automatically executed.  Is anyone working on such a
> > > feature for QuickCheck?
> >
> > The 'quickCheck' function does this, iirc.
>
> I don't think so.  I do:
>
> > cat foo.hs
> import Test.QuickCheck
> main = quickCheck False
> > runhaskell foo.hs
> Falsifiable, after 0 tests:
> > echo $?
> 0
>
> As far as I can see, quickCheck never causes an error exit to happen.
> And it doesn't even return IO Bool, so I can't use quickCheck to write
> my own function that calls System.Exit.exitFailure

This problem was discussed recently:
 http://www.haskell.org/pipermail/haskell-cafe/2007-November/034811.html