Function elipdotter::set::difference

pub fn difference<T, L, R>(a: L, b: R) -> impl Iterator<Item = T>where
    T: Ord,
    L: IntoIterator<Item = T>,
    R: IntoIterator<Item = T>,

Returns an iterator of the items in a AND NOT in b.

Both iterators must be sorted. The returned iterator is also sorted.