mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-11 08:05:12 +00:00
36 lines
525 B
Rust
36 lines
525 B
Rust
//@ run-pass
|
|
#![allow(dead_code)]
|
|
#![allow(unused_mut)]
|
|
#![allow(unused_variables)]
|
|
|
|
use std::io::{self, Write};
|
|
|
|
trait Trait {
|
|
fn f(&self);
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct Struct {
|
|
x: isize,
|
|
y: isize,
|
|
}
|
|
|
|
impl Trait for Struct {
|
|
fn f(&self) {
|
|
println!("Hi!");
|
|
}
|
|
}
|
|
|
|
fn foo(mut a: Box<dyn Write>) {}
|
|
|
|
pub fn main() {
|
|
let a = Struct { x: 1, y: 2 };
|
|
let b: Box<dyn Trait> = Box::new(a);
|
|
b.f();
|
|
let c: &dyn Trait = &a;
|
|
c.f();
|
|
|
|
let out = io::stdout();
|
|
foo(Box::new(out));
|
|
}
|