checkito 5.0.0

A safe, efficient and simple QuickCheck-inspired library to generate shrinkable random data mainly oriented towards generative/property/exploratory testing.
Documentation 
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use crate::{generate::Generate, primitive::Constant, shrink::Shrink, state::State};

#[derive(Clone, Debug)]
pub struct Keep<T: ?Sized>(pub(crate) T);

impl<G: Generate + ?Sized> Generate for Keep<G> {
    type Item = G::Item;
    type Shrink = Keep<G::Shrink>;

    const CARDINALITY: Option<u128> = G::CARDINALITY;

    fn generate(&self, state: &mut State) -> Self::Shrink {
        Keep(self.0.generate(state))
    }

    fn cardinality(&self) -> Option<u128> {
        self.0.cardinality()
    }
}

impl<S: Shrink> Shrink for Keep<S> {
    type Item = S::Item;

    fn item(&self) -> Self::Item {
        self.0.item()
    }

    fn shrink(&mut self) -> Option<Self> {
        None
    }
}

impl<C: Constant> Constant for Keep<C> {
    const VALUE: Self = Self(C::VALUE);
}