Function `diff_with`

fn diff_with<I, J, F>(i: I, j: J, is_equal: F) -> Option<Diff<<I as >::IntoIter, <J as >::IntoIter>>
where
    I: IntoIterator,
    J: IntoIterator,
    F: FnMut(&<I as >::Item, &<J as >::Item) -> bool

Compares every element yielded by both i and j with the given function in lock-step and returns a Diff which describes how j differs from i.

If the number of elements yielded by j is less than the number of elements yielded by i, the number of j elements yielded will be returned along with i's remaining elements as Diff::Shorter.

If the two elements of a step differ, the index of those elements along with the remaining elements of both i and j are returned as Diff::FirstMismatch.

If i becomes exhausted before j becomes exhausted, the number of elements in i along with the remaining j elements will be returned as Diff::Longer.