[Haskell-cafe] QuickCheck behaving strange

[Tobias Olausson]

It seems this was the case, thank you!

/Tobias

2009/7/24 Felipe Lessa <felipe.lessa at gmail.com>:
> On Fri, Jul 24, 2009 at 08:11:12PM +0200, Tobias Olausson wrote:
>> prop_schedule :: Ord t => [Interval a t] -> Bool
>> prop_schedule []        = True
>> prop_schedule [a]       = True
>> prop_schedule (x:y:ys)  = end x <= begin y && prop_schedule (y:ys)
> [..]
>> How come QuickCheck passes 100 tests of random lists? One would think that
>> at least one of the generated lists would be unsorted. It also passes
>> 1000 and even
>> 10000 tests.
>
> Probably it was defaulting to 'Interval () ()'.  Try to do
>
>   :s -Wall
>
> on your GHCi prompt to see when these things happen.
>
> --
> Felipe.
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-- 
Tobias Olausson
tobsan at gmail.com