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Small has no CoArbitrary instance #360

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andreasabel opened this issue Jul 25, 2023 · 1 comment · May be fixed by #372
Open

Small has no CoArbitrary instance #360

andreasabel opened this issue Jul 25, 2023 · 1 comment · May be fixed by #372
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enhancement

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@andreasabel
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When trying to use $allProperties on a prop_Foo that uses type Small Int:

No instance for ‘CoArbitrary (Small Int)’
        arising from a use of ‘property’

Is there a reason why Small cannot have a CoArbitrary instance?
andreasabel added a commit to agda/agda that referenced this issue Jul 25, 2023
@andreasabel
[ testsuite ] type signatures for the Utils.ListT quickcheck props
0edd662 
I wondered what to use for the polymorphic types, and settled for `Word8`.
One would think that it generates more collisions than a large type like `Int` or `Integer`.
Not tested.

I also tried `Small Int` but this does not have a `CoArbitrary` instance.
Asked upstream about this:
- nick8325/quickcheck#360
@MaximilianAlgehed
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@nick8325 unless there is some reason for this that I can't make sense of I'm going to add instances of CoArbitrary and Function for the types in Test.QuickCheck.Modifiers.

@MaximilianAlgehed MaximilianAlgehed linked a pull request Mar 21, 2024 that will close this issue
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JobPetrovcic pushed a commit to JobPetrovcic/agda that referenced this issue Apr 12, 2024
@andreasabel @JobPetrovcic
[ testsuite ] type signatures for the Utils.ListT quickcheck props
bde8a64 
I wondered what to use for the polymorphic types, and settled for `Word8`.
One would think that it generates more collisions than a large type like `Int` or `Integer`.
Not tested.

I also tried `Small Int` but this does not have a `CoArbitrary` instance.
Asked upstream about this:
- nick8325/quickcheck#360
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Add additional arbitrary instances nick8325/quickcheck
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@andreasabel @MaximilianAlgehed