pub fn join<'s, C, N>( current: C, new: N, ) -> impl Iterator<Item = (&'s str, &'s str)> + Clonewhere C: Iterator<Item = (&'s str, &'s str)> + Clone, N: Iterator<Item = (&'s str, &'s str)> + Clone + 's,
Joins two key-value (&str, &str) iterators removing from current any element whose key is present in new.
(&str, &str)
current
new