Re: [Haskell-cafe] QuickCheck, (Ord a)=> [a] -> Property problem

Hi, I tested with Haskell platform 2011 with QuickCheck 2.4.0.1. It produced 100 cases passed, but can't report failed case. verboseCheck still told me that [(), (), ... ()] are generated as instance to (Ord a) The only way is to specify the non-ambitious type for example, Int, like below: test (prop_foo::[Int]->Property) Cheers. -- Larry. On Apr 22, 5:56 am, Nick Smallbone wrote:

"larry.liuxinyu" writes:

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Somebody told me that: Eduard Sergeev • BTW, more recent QuickCheck (from Haskell Platform 2011.2.0.X - contains QuickCheck-2.4.0.1) seems to identifies the problem correctly:

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*** Failed! Falsifiable (after 3 tests and 2 shrinks): [0,1] False

I don't think this can be true: the problem occurs in GHCi and there's no way for QuickCheck to detect it. And when I tested it I got the same problem. There must be some difference between the properties you both tested...

Nick

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