Access iterator inside its for loop

Question

I am testing a custom bi-directional iterator in rust but i ran into error

error[E0382]: borrow of moved value: `iter`
   --> src/main.rs:40:13
    |
37  |     let mut iter = BiIterator::from(vec![1, 2, 3]);
    |         -------- move occurs because `iter` has type `BiIterator<i32>`, which does not implement the `Copy` trait
38  |     for i in iter {
    |              ----
    |              |
    |              `iter` moved due to this implicit call to `.into_iter()`
    |              help: consider borrowing to avoid moving into the for loop: `&iter`
39  |         if i == 3 {
40  |             iter.position(0);
    |             ^^^^^^^^^^^^^^^^ value borrowed here after move
    |
note: this function takes ownership of the receiver `self`, which moves `iter`

reproducable code