Function iter_set::symmetric_difference

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

Take the symmetric_difference of two sets represented by sorted, deduplicated iterators.

Time complexity: O(a.len() + b.len()).