File: forgetting_references.rs

package info (click to toggle)
rustc-web 1.78.0%2Bdfsg1-2~deb12u3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,245,420 kB
  • sloc: xml: 147,985; javascript: 18,022; sh: 11,083; python: 10,265; ansic: 6,172; cpp: 5,023; asm: 4,390; makefile: 4,269
file content (39 lines) | stat: -rw-r--r-- 1,082 bytes parent folder | download | duplicates (2)
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
//@ check-pass

#![warn(forgetting_references)]

use std::mem::forget;

struct SomeStruct;

fn main() {
    forget(&SomeStruct); //~ WARN calls to `std::mem::forget`

    let mut owned = SomeStruct;
    forget(&owned); //~ WARN calls to `std::mem::forget`
    forget(&&owned); //~ WARN calls to `std::mem::forget`
    forget(&mut owned); //~ WARN calls to `std::mem::forget`
    forget(owned);

    let reference1 = &SomeStruct;
    forget(&*reference1); //~ WARN calls to `std::mem::forget`

    let reference2 = &mut SomeStruct;
    forget(reference2); //~ WARN calls to `std::mem::forget`

    let ref reference3 = SomeStruct;
    forget(reference3); //~ WARN calls to `std::mem::forget`
}

#[allow(dead_code)]
fn test_generic_fn_forget<T>(val: T) {
    forget(&val); //~ WARN calls to `std::mem::forget`
    forget(val);
}

#[allow(dead_code)]
fn test_similarly_named_function() {
    fn forget<T>(_val: T) {}
    forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
    std::mem::forget(&SomeStruct); //~ WARN calls to `std::mem::forget`
}