Who drop first?

#[derive(Debug)]
struct Appellation {
    name: String
}
impl Drop for Appellation {
    fn drop(&mut self) {
        println!("{:?} dropped", self);
    }
}
fn complicated_condition() -> bool {
    true
}
fn main() {
    let p;
    {
        let mut q = Appellation {
            name: "hello".to_string(),
        };
        if complicated_condition() {
            p = q;
        }
    }
    println!("who drop first?");
}

上面那个代码片段中，Appellation何时drop取决于complicated_condition的返回值，如果complicated_condition返回true，那么q的所有权即转移到了p上，当q goes out of scope时，p还活着，所以Appellation将在 println后 drop，如果complicated_condition返回false，则当q goes out of scope时，Appellation就会drop，将在println之前