Hi.  I have a slice of some type T  data: &[T] and slice of indices idx: &[usize].  The idx - is a indices that indicate where each subslice start and one extra element at the end which is the count of the data  for example:  let mut data = [1, 2, 3, 1, 2, 3, 4, 1, 2]; let idx = [0, 3, 7, 9];   // Idx is just encoded ranges 0..3 , 3..7 , 7..9 for indexing 'data' // Result must be iterator by mut slices: &mut data[0..3], &mut data[3..7], &mut data[7..9]   Is it possible to make par iterator like ...