File: dropck-eyepatch-manuallydrop.rs

package info (click to toggle)
rustc 1.87.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 925,564 kB
  • sloc: xml: 158,127; python: 36,039; javascript: 19,761; sh: 19,737; cpp: 18,981; ansic: 13,133; asm: 4,376; makefile: 710; perl: 29; lisp: 28; ruby: 19; sql: 11
file content (22 lines) | stat: -rw-r--r-- 483 bytes parent folder | download | duplicates (16) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
 
//@ check-pass
//! This test checks that dropck knows that ManuallyDrop does not drop its field.
#![feature(dropck_eyepatch)]

use std::mem::ManuallyDrop;

struct S<T>(ManuallyDrop<T>);

unsafe impl<#[may_dangle] T> Drop for S<T> {
    fn drop(&mut self) {}
}

struct NonTrivialDrop<'a>(&'a str);
impl<'a> Drop for NonTrivialDrop<'a> {
    fn drop(&mut self) {}
}

fn main() {
    let s = String::from("string");
    let _t = S(ManuallyDrop::new(NonTrivialDrop(&s)));
    drop(s);
}