[Haskell-cafe] Need advise with using Quickcheck

Han Joosten han.joosten.han at gmail.com
Sat Jun 12 21:53:50 UTC 2021

Thanks all for the responses. I managed to put them all together and I [got
it all to work](


Op za 12 jun. 2021 om 13:28 schreef Henning Thielemann <
lemming at henning-thielemann.de>:

> On Sat, 12 Jun 2021, Han Joosten wrote:
> > Thanks for this respons, Rubén. I might not have explained what I am
> looking for very well. I already have
> > instance Arbitrary Foo
> > That is not the problem. The problem is, that when a counterexample is
> found, it is dumped to the output with the `show` function.
> > I would like to be able to use another function for that, say show'. In
> order to do so, I need to obtain the counterexample itself
> > in some way, so I can use it to generate a useful message after the
> tests are done.
> https://hackage.haskell.org/package/QuickCheck-2.14.2/docs/Test-QuickCheck.html#v:forAllShow
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