realwangliqiu's questions

fn dangle() {
    fn get_str<'a>(s: *const String) -> &'a str {
        unsafe { &*s }
    }
    
    let s = String::from("hello");
    let dangling = get_str(&s);
    drop(s);
    println!("Invalid str: {}", dangling);
}

#[test]
fn test() {
    dangle();  // it should panic, but does not
}

fn main() {
    dangle();  // panics
}

main()正如我所料，该函数崩溃了。但为什么该test()函数能够成功运行？