pub trait Product {
    fn name(&self) -> &str;
    fn set_name(&mut self, name: String);
}

pub trait ProductIterator {
    type Item<'this>: Product
    where
        Self: 'this;

    fn next(&mut self) -> Option<Self::Item<'_>>;
}

pub trait Store {
    type Product<'this>: Product
    where
        Self: 'this;

    fn products<'product, 'iterator: 'product, 'this: 'iterator>(
        &'this mut self,
    ) -> impl ProductIterator<Item<'product> = Self::Product<'product>> + 'iterator;
}

impl<I> ProductIterator for I
where
    I: Iterator<Item: Product>,
{
    type Item<'this> = I::Item
    where
        Self: 'this;

    fn next(&mut self) -> Option<Self::Item<'_>> {
        Iterator::next(self)
    }
}

impl<'a, S> Store for &'a mut S
where
    S: Store,
{
    type Product<'this> = S::Product<'this>
    where
        Self: 'this;

    fn products<'product, 'iterator: 'product, 'this: 'iterator>(
        &'this mut self,
    ) -> impl ProductIterator<Item<'product> = Self::Product<'product>> + 'iterator {
        Store::products(*self)
    }
}