src/test/compile-fail/overloaded-calls-bad.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(unboxed_closures)]
  12
  13 use std::ops::FnMut;
  14
  15 struct S {
  16     x: isize,
  17     y: isize,
  18 }
  19
  20 impl FnMut<(isize,)> for S {
  21     extern "rust-call" fn call_mut(&mut self, (z,): (isize,)) -> isize {
  22         self.x * self.y * z
  23     }
  24 }
  25
  26 impl FnOnce<(isize,)> for S {
  27     type Output = isize;
  28     extern "rust-call" fn call_once(mut self, (z,): (isize,)) -> isize {
  29         self.call_mut((z,))
  30     }
  31 }
  32
  33 fn main() {
  34     let mut s = S {
  35         x: 3,
  36         y: 3,
  37     };
  38     let ans = s("what");    //~ ERROR mismatched types
  39     let ans = s();  //~ ERROR this function takes 1 parameter but 0 parameters were supplied
  40     let ans = s("burma", "shave");
  41     //~^ ERROR this function takes 1 parameter but 2 parameters were supplied
  42 }