2 // Checks that the Fn trait hierarchy rules permit
3 // FnMut or FnOnce to be used where FnMut is implemented.
5 #![feature(unboxed_closures, fn_traits)]
9 impl FnMut<(i32,)> for S {
10 extern "rust-call" fn call_mut(&mut self, (x,): (i32,)) -> i32 {
15 impl FnOnce<(i32,)> for S {
18 extern "rust-call" fn call_once(mut self, args: (i32,)) -> i32 { self.call_mut(args) }
21 fn call_it_mut<F:FnMut(i32)->i32>(f: &mut F, x: i32) -> i32 {
25 fn call_it_once<F:FnOnce(i32)->i32>(f: F, x: i32) -> i32 {
30 let y = call_it_mut(&mut S, 22);
31 let z = call_it_once(S, 22);