rust/src/test/compile-fail/overloaded-calls-nontuple.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(unboxed_closures)]

use std::ops::FnMut;

struct S {
    x: isize,
    y: isize,
}

impl FnMut<isize> for S {
    type Output = isize;
    extern "rust-call" fn call_mut(&mut self, z: isize) -> isize {
        self.x + self.y + z
    }
}

fn main() {
    let mut s = S {
        x: 1,
        y: 2,
    };
    drop(s(3))  //~ ERROR cannot use call notation
}