tests/ui/issues/issue-18952.rs

   1 // This issue tests fn_traits overloading on arity.
   2 // run-pass
   3
   4 #![feature(fn_traits)]
   5 #![feature(unboxed_closures)]
   6
   7 struct Foo;
   8
   9 impl Fn<(isize, isize)> for Foo {
  10     extern "rust-call" fn call(&self, args: (isize, isize)) -> Self::Output {
  11         println!("{:?}", args);
  12         (args.0 + 1, args.1 + 1)
  13     }
  14 }
  15
  16 impl FnMut<(isize, isize)> for Foo {
  17     extern "rust-call" fn call_mut(&mut self, args: (isize, isize)) -> Self::Output {
  18         println!("{:?}", args);
  19         (args.0 + 1, args.1 + 1)
  20     }
  21 }
  22
  23 impl FnOnce<(isize, isize)> for Foo {
  24     type Output = (isize, isize);
  25     extern "rust-call" fn call_once(self, args: (isize, isize)) -> Self::Output {
  26         println!("{:?}", args);
  27         (args.0 + 1, args.1 + 1)
  28     }
  29 }
  30
  31 impl Fn<(isize, isize, isize)> for Foo {
  32     extern "rust-call" fn call(&self, args: (isize, isize, isize)) -> Self::Output {
  33         println!("{:?}", args);
  34         (args.0 + 3, args.1 + 3, args.2 + 3)
  35     }
  36 }
  37
  38 impl FnMut<(isize, isize, isize)> for Foo {
  39     extern "rust-call" fn call_mut(&mut self, args: (isize, isize, isize)) -> Self::Output {
  40         println!("{:?}", args);
  41         (args.0 + 3, args.1 + 3, args.2 + 3)
  42     }
  43 }
  44 impl FnOnce<(isize, isize, isize)> for Foo {
  45     type Output = (isize, isize, isize);
  46     extern "rust-call" fn call_once(self, args: (isize, isize, isize)) -> Self::Output {
  47         println!("{:?}", args);
  48         (args.0 + 3, args.1 + 3, args.2 + 3)
  49     }
  50 }
  51
  52 fn main() {
  53     let foo = Foo;
  54     assert_eq!(foo(1, 1), (2, 2));
  55     assert_eq!(foo(1, 1, 1), (4, 4, 4));
  56 }