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forAll :: (Show a, Testable t) => Gen a -> Shrink a -> (a -> t) -> Property
forAll argGen shrink prop =
Property $ Gen $ \rand -> -- Create a new property that will
let (rand1, rand2) = split rand -- Split the generator in two
arg = runGen argGen rand1 -- Use the first generator to produce an arg
tree = resultTree shrink arg prop -- Enrich the sub-property result tree
in runProp tree rand2 -- Run the property with the second generator
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