src/test/ui/specialization/issue-36804.rs

   1 // check-pass
   2 #![feature(specialization)]
   3
   4 pub struct Cloned<I>(I);
   5
   6 impl<'a, I, T: 'a> Iterator for Cloned<I>
   7 where
   8     I: Iterator<Item = &'a T>,
   9     T: Clone,
  10 {
  11     type Item = T;
  12
  13     fn next(&mut self) -> Option<T> {
  14         unimplemented!()
  15     }
  16
  17     default fn count(self) -> usize where Self: Sized {
  18         self.fold(0, |cnt, _| cnt + 1)
  19     }
  20 }
  21
  22 impl<'a, I, T: 'a> Iterator for Cloned<I>
  23 where
  24     I: Iterator<Item = &'a T>,
  25     T: Copy,
  26 {
  27     fn count(self) -> usize {
  28         unimplemented!()
  29     }
  30 }
  31
  32 fn main() {
  33     let a = [1,2,3,4];
  34     Cloned(a.iter()).count();
  35 }