mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-06 13:44:13 +00:00
27 lines
520 B
Rust
27 lines
520 B
Rust
#![feature(fn_traits, unboxed_closures)]
|
|
|
|
use std::{fmt, ops};
|
|
|
|
struct Debuger<T> {
|
|
x: T
|
|
}
|
|
|
|
impl<T: fmt::Debug> ops::FnOnce<(),> for Debuger<T> {
|
|
type Output = ();
|
|
fn call_once(self, _args: ()) {
|
|
//~^ ERROR `call_once` has an incompatible type for trait
|
|
//~| expected signature `extern "rust-call" fn
|
|
//~| found signature `fn
|
|
println!("{:?}", self.x);
|
|
}
|
|
}
|
|
|
|
fn make_shower<T>(x: T) -> Debuger<T> {
|
|
Debuger { x: x }
|
|
}
|
|
|
|
pub fn main() {
|
|
let show3 = make_shower(3);
|
|
show3();
|
|
}
|