rust/tests/ui/overloaded/overloaded-calls-zero-args.rs
2023-01-11 09:32:08 +00:00

31 lines
483 B
Rust

// run-pass
#![feature(unboxed_closures, fn_traits)]
use std::ops::FnMut;
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);
}