From set.rs - source

    fn sub(self, rhs: &BTreeSet<T, A>) -> BTreeSet<T, A> {
        BTreeSet::from_sorted_iter(
            self.difference(rhs).cloned(),
            ManuallyDrop::into_inner(self.map.alloc.clone()),
        )
    }

I don't understand what is going on here.

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