| #![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 |
| //~| NOTE expected signature `extern "rust-call" fn |
| //~| NOTE found signature `fn |
| //~| NOTE expected "rust-call" fn, found "Rust" fn |
| println!("{:?}", self.x); |
| } |
| } |
| |
| fn make_shower<T>(x: T) -> Debuger<T> { |
| Debuger { x: x } |
| } |
| |
| pub fn main() { |
| let show3 = make_shower(3); |
| show3(); |
| } |
