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fn main() {
    let mut vec = vec![1, 2, 3];
 
    println!("{:p} {:p}({})", vec.as_ptr(), &vec[0], vec[0]);
 
    let ptr = &vec[0];
 
    println!("{:p} {:p}({}) {:p}({})", vec.as_ptr(), &vec[0], vec[0], ptr, ptr);
 
    vec.push(4);
 
    println!("{:p} {:p}({}) {:p}({})", vec.as_ptr(), &vec[0], vec[0], ptr, ptr);
}

prog.rs:10:5: 10:8 error: cannot borrow `vec` as mutable because it is also borrowed as immutable
prog.rs:10     vec.push(4);
               ^~~
prog.rs:6:16: 6:19 note: previous borrow of `vec` occurs here; the immutable borrow prevents subsequent moves or mutable borrows of `vec` until the borrow ends
prog.rs:6     let ptr = &vec[0];
                         ^~~
prog.rs:13:2: 13:2 note: previous borrow ends here
prog.rs:1 fn main() {
...
prog.rs:13 }
           ^
error: aborting due to previous error

Standard output is empty