1 error[E0499]: cannot borrow `v` as mutable more than once at a time
2 --> $DIR/borrowck-vec-pattern-loan-from-mut.rs:6:13
4 LL | let vb: &mut [isize] = &mut v;
5 | ------ first mutable borrow occurs here
7 LL | v.push(tail[0] + tail[1]);
8 | ^^^^^^^-------^^^^^^^^^^^
10 | | first borrow later used here
11 | second mutable borrow occurs here
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0499`.