File: trait_upcasting.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 (26 lines) | stat: -rw-r--r-- 500 bytes parent folder | download | duplicates (3) 
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
 
//! Test that we allow unsizing `Trait<Concrete>` to `Trait<Opaque>` and vice versa

//@ check-pass

trait Trait<T> {}

impl<T, U> Trait<T> for U {}

fn hello() -> &'static (dyn Trait<impl Sized> + Send) {
    if false {
        let x = hello();
        let _: &'static dyn Trait<()> = x;
    }
    todo!()
}

fn bye() -> &'static dyn Trait<impl Sized> {
    if false {
        let mut x = bye();
        let y: &'static (dyn Trait<()> + Send) = &();
        x = y;
    }
    todo!()
}

fn main() {}