src/test/ui/issues/issue-15094.rs

   1 #![feature(fn_traits, unboxed_closures)]
   2
   3 use std::{fmt, ops};
   4
   5 struct Debuger<T> {
   6     x: T
   7 }
   8
   9 impl<T: fmt::Debug> ops::FnOnce<(),> for Debuger<T> {
  10     type Output = ();
  11     fn call_once(self, _args: ()) {
  12     //~^ ERROR `call_once` has an incompatible type for trait
  13     //~| expected fn pointer `extern "rust-call" fn
  14     //~| found fn pointer `fn
  15         println!("{:?}", self.x);
  16     }
  17 }
  18
  19 fn make_shower<T>(x: T) -> Debuger<T> {
  20     Debuger { x: x }
  21 }
  22
  23 pub fn main() {
  24     let show3 = make_shower(3);
  25     show3();
  26 }