File: union-manuallydrop-rpass.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (41 lines) | stat: -rw-r--r-- 635 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
//@ run-pass
#![allow(dead_code)]

use std::mem::needs_drop;
use std::mem::ManuallyDrop;

struct NeedDrop;

impl Drop for NeedDrop {
    fn drop(&mut self) {}
}

union UnionOk1<T> {
    empty: (),
    value: ManuallyDrop<T>,
}

union UnionOk2 {
    value: ManuallyDrop<NeedDrop>,
}

#[allow(dead_code)]
union UnionOk3<T: Copy> {
    empty: (),
    value: T,
}

trait Foo {}

trait ImpliesCopy: Copy {}

#[allow(dead_code)]
union UnionOk4<T: ImpliesCopy> {
    value: T,
}

fn main() {
    // NeedDrop should not make needs_drop true
    assert!(!needs_drop::<UnionOk1<NeedDrop>>());
    assert!(!needs_drop::<UnionOk3<&dyn Foo>>());
}