src/test/ui/mismatched_types/overloaded-calls-bad.rs

   1 #![feature(fn_traits, unboxed_closures)]
   2
   3 use std::ops::FnMut;
   4
   5 struct S {
   6     x: isize,
   7     y: isize,
   8 }
   9
  10 impl FnMut<(isize,)> for S {
  11     extern "rust-call" fn call_mut(&mut self, (z,): (isize,)) -> isize {
  12         self.x * self.y * z
  13     }
  14 }
  15
  16 impl FnOnce<(isize,)> for S {
  17     type Output = isize;
  18     extern "rust-call" fn call_once(mut self, (z,): (isize,)) -> isize {
  19         self.call_mut((z,))
  20     }
  21 }
  22
  23 struct F;
  24
  25 impl FnOnce<(i32,)> for F {
  26     type Output = ();
  27
  28     extern "rust-call" fn call_once(self, args: (i32,)) -> Self::Output {}
  29 }
  30
  31 fn main() {
  32     let mut s = S { x: 3, y: 3 };
  33     let ans = s("what");
  34     //~^ ERROR mismatched types
  35     let ans = s();
  36     //~^ ERROR this function takes 1 argument but 0 arguments were supplied
  37     let ans = s("burma", "shave");
  38     //~^ ERROR this function takes 1 argument but 2 arguments were supplied
  39
  40     F("");
  41     //~^ ERROR mismatched types
  42 }