File: no-unsize-coerce-dyn-trait.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 (13 lines) | stat: -rw-r--r-- 337 bytes parent folder | download | duplicates (7) 
1
2
3
4
5
6
7
8
9
10
11
12
13
 
#![feature(dyn_star, trait_upcasting)]
//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes

trait A: B {}
trait B {}
impl A for usize {}
impl B for usize {}

fn main() {
    let x: Box<dyn* A> = Box::new(1usize as dyn* A);
    let y: Box<dyn* B> = x;
    //~^ ERROR mismatched types
}