Rust does have these abstractions. The corresponding rust traits are `IntoIterator<Item=T>` and `Iterator<Item=T>`. For example:

  - Vec<T> implements IntoIterator<Item=T>
  - &Vec<T> implements IntoIterator<Item=&T>
  - &mut Vec<T> implements IntoIterator<Item=&mut T>

and consequently,

  - vec.into_iter() implements Iterator<Item=T>
  - (&vec).into_iter() (or vec.iter()) implements Iterator<Item=&T>
  - (&mut vec).into_iter() (or vec.iter_mut()) implements Iterator<Item=&mut T>