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#![feature(fn_traits, unboxed_closures)]
use std::ops::FnMut;
struct S {
x: isize,
y: isize,
}
impl FnMut<(isize,)> for S {
extern "rust-call" fn call_mut(&mut self, (z,): (isize,)) -> isize {
self.x * self.y * z
}
}
impl FnOnce<(isize,)> for S {
type Output = isize;
extern "rust-call" fn call_once(mut self, (z,): (isize,)) -> isize {
self.call_mut((z,))
}
}
struct F;
impl FnOnce<(i32,)> for F {
type Output = ();
extern "rust-call" fn call_once(self, args: (i32,)) -> Self::Output {}
}
fn main() {
let mut s = S { x: 3, y: 3 };
let ans = s("what");
//~^ ERROR mismatched types
let ans = s();
//~^ ERROR function takes 1 argument but 0 arguments were supplied
let ans = s("burma", "shave");
//~^ ERROR function takes 1 argument but 2 arguments were supplied
F("");
//~^ ERROR mismatched types
}
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