[Haskell-cafe] SmallCheck Depth

[Roman Cheplyaka]

The choice of what belongs to what depth is rather arbitrary.

You say you'd expect all three constructors to be of depth 0. What about

  data A = A1 .. A50

?

What about Char or Int?

See the problem?

On 05/02/15 03:23, Omari Norman wrote:
> The original SmallCheck paper [0] gives a type
> 
> data Name = P | Q | R
> 
> and states that all values of type Name have depth 0.  To me this
> suggests that all values of type Bool would have depth 0 as well,
> seeing as Bool would simply be
> 
> data Bool = True | False
> 
> Sure enough, if I load up ghci with SmallCheck 0.2.1, I get
> 
>> series 0 :: [Bool]
> [True, False]
> 
> But in QuickCheck 1.1.1 I get
> 
>> list 0 series :: [Bool]
> []
> 
> Very puzzling to me is that it seems the definition of series for Bool
> has not changed in the new version.  Both versions have something like
> 
> series = cons0 True \/ cons0 False
> 
> So what explains the different behavior?  Thanks.  --Omari
> 
> [0] http://www.cs.york.ac.uk/fp/smallcheck/smallcheck.pdf
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