src/test/ui/borrowck/borrowck-vec-pattern-loan-from-mut.stderr

error[E0499]: cannot borrow `v` as mutable more than once at a time
  --> $DIR/borrowck-vec-pattern-loan-from-mut.rs:8:13
   |
LL |     let vb: &mut [isize] = &mut v;
   |                                 - first mutable borrow occurs here
...
LL |             v.push(tail[0] + tail[1]);
   |             ^ second mutable borrow occurs here
...
LL | }
   | - first borrow ends here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0499`.