// MIR for `mut_ref` after built

fn mut_ref(_1: &mut i32) -> &mut i32 {
    let mut _0: &mut i32;
    let mut _2: *mut i32;

    bb0: {
        _2 = &raw mut (*_1);
        _0 = &mut (*_2);
        Retag(_0);
        return;
    }
}