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fn main() {
    let mut a = Vec::new();
    let b = &a;
    a.push(1);
}

prog.rs:4:5: 4:6 error: cannot borrow `a` as mutable because it is also borrowed as immutable
prog.rs:4     a.push(1);
              ^
prog.rs:3:14: 3:15 note: previous borrow of `a` occurs here; the immutable borrow prevents subsequent moves or mutable borrows of `a` until the borrow ends
prog.rs:3     let b = &a;
                       ^
prog.rs:5:2: 5:2 note: previous borrow ends here
prog.rs:1 fn main() {
prog.rs:2     let mut a = Vec::new();
prog.rs:3     let b = &a;
prog.rs:4     a.push(1);
prog.rs:5 }
          ^
error: aborting due to previous error

Standard output is empty