File: wf-convert-dyn-incompat-trait-obj-box.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: 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 (18 lines) | stat: -rw-r--r-- 403 bytes parent folder | download | duplicates (3) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 
// Check that we do not allow casts or coercions
// to dyn-incompatible trait objects inside a Box

#![feature(dyn_compatible_for_dispatch)]

trait Trait: Sized {}

struct S;

impl Trait for S {}

fn takes_box(t: Box<dyn Trait>) {}

fn main() {
    Box::new(S) as Box<dyn Trait>; //~ ERROR E0038
    let t_box: Box<dyn Trait> = Box::new(S); //~ ERROR E0038
    takes_box(Box::new(S)); //~ ERROR E0038
}