1 error[E0499]: cannot borrow `v` as mutable more than once at a time
2 --> $DIR/one_line.rs:13:12
4 LL | v.push(v.pop().unwrap()); //~ ERROR cannot borrow
5 | -------^----------------
7 | | second mutable borrow occurs here
8 | first mutable borrow occurs here
9 | borrow later used here
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0499`.