Function compute_updated_locations 

pub fn compute_updated_locations<T, I, F>(
    target: &[T],
    insertions: I,
    updated: F,
)
where
    I: Iterator<Item = usize> + ExactSizeIterator,
    F: FnMut(OriginalLocation, usize),

Compute the updated locations of all elements (original + inserted).

See InsertionSet::compute_updated_locations for details