mirror of https://github.com/rust-lang/rust
29 lines
462 B
Rust
29 lines
462 B
Rust
//@ run-pass
|
|
|
|
#![feature(unboxed_closures, fn_traits)]
|
|
|
|
struct S {
|
|
x: i32,
|
|
y: i32,
|
|
}
|
|
|
|
impl FnMut<()> for S {
|
|
extern "rust-call" fn call_mut(&mut self, (): ()) -> i32 {
|
|
self.x * self.y
|
|
}
|
|
}
|
|
|
|
impl FnOnce<()> for S {
|
|
type Output = i32;
|
|
extern "rust-call" fn call_once(mut self, args: ()) -> i32 { self.call_mut(args) }
|
|
}
|
|
|
|
fn main() {
|
|
let mut s = S {
|
|
x: 3,
|
|
y: 3,
|
|
};
|
|
let ans = s();
|
|
assert_eq!(ans, 9);
|
|
}
|