1 // Checks that the Fn trait hierarchy rules do not permit
2 // Fn to be used where FnMut is implemented.
4 #![feature(fn_traits, unboxed_closures)]
6 use std::ops::{Fn,FnMut,FnOnce};
10 impl FnMut<(isize,)> for S {
11 extern "rust-call" fn call_mut(&mut self, (x,): (isize,)) -> isize {
16 impl FnOnce<(isize,)> for S {
19 extern "rust-call" fn call_once(mut self, args: (isize,)) -> isize { self.call_mut(args) }
22 fn call_it<F:Fn(isize)->isize>(f: &F, x: isize) -> isize {
27 let x = call_it(&S, 22);