error[E0499]: cannot borrow `v` as mutable more than once at a time | |
--> $DIR/one_line.rs:3:12 | |
| | |
LL | v.push(v.pop().unwrap()); | |
| - ---- ^ second mutable borrow occurs here | |
| | | | |
| | first borrow later used by call | |
| first mutable borrow occurs here | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0499`. |