2 // Checks that the Fn trait hierarchy rules permit
3 // any Fn trait to be used where Fn is implemented.
5 #![feature(unboxed_closures, fn_traits)]
7 use std::ops::{Fn,FnMut,FnOnce};
11 impl Fn<(i32,)> for S {
12 extern "rust-call" fn call(&self, (x,): (i32,)) -> i32 {
17 impl FnMut<(i32,)> for S {
18 extern "rust-call" fn call_mut(&mut self, args: (i32,)) -> i32 { self.call(args) }
21 impl FnOnce<(i32,)> for S {
23 extern "rust-call" fn call_once(self, args: (i32,)) -> i32 { self.call(args) }
26 fn call_it<F:Fn(i32)->i32>(f: &F, x: i32) -> i32 {
30 fn call_it_mut<F:FnMut(i32)->i32>(f: &mut F, x: i32) -> i32 {
34 fn call_it_once<F:FnOnce(i32)->i32>(f: F, x: i32) -> i32 {
39 let x = call_it(&S, 22);
40 let y = call_it_mut(&mut S, 22);
41 let z = call_it_once(S, 22);