File: const_forget.rs

package info (click to toggle)
rustc 1.88.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 934,128 kB
  • sloc: xml: 158,127; python: 36,062; javascript: 19,855; sh: 19,700; cpp: 18,947; ansic: 12,993; asm: 4,792; makefile: 690; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (22 lines) | stat: -rw-r--r-- 551 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

#![allow(forgetting_copy_types)]

use std::mem::forget;

const _: () = forget(0i32);
const _: () = forget(Vec::<Vec<Box<i32>>>::new());

// Writing this function signature without const-forget
// triggers compiler errors:
// 1) That we use a non-const fn inside a const fn
// 2) without the forget, it complains about the destructor of Box
//
// FIXME: this method cannot be called in const-eval yet, as Box isn't
// const constructable
#[allow(unused)]
const fn const_forget_box<T: ?Sized>(b: Box<T>) {
    forget(b);
}

fn main() {}