#[derive(IteratorsMut)]Expand description
A procedural macro fully implementing [IterableByValue] and
[IterableByValueFrom] for subslices on top of a the SubsliceImplMut
structure generated by the derive macro [SubsliceMut].
The macro defines a structure IterMut that keeps track of a mutable reference
to a slice, and of a current position, and that is used to implement
IterableByValue on SubsliceImpl.
Note that since IterMut provides iterators by value, it cannot use to
mutate the subslice. Moreover, non-mutable subslicing on a
SubsliceImplMut will yield a SubsliceImpl.