tests/ui/issues/issue-22036.rs

   1 // run-pass
   2
   3 trait DigitCollection: Sized {
   4     type Iter: Iterator<Item = u8>;
   5     fn digit_iter(self) -> Self::Iter;
   6
   7     fn digit_sum(self) -> u32 {
   8         self.digit_iter()
   9             .map(|digit: u8| digit as u32)
  10             .fold(0, |sum, digit| sum + digit)
  11     }
  12 }
  13
  14 impl<I> DigitCollection for I where I: Iterator<Item=u8> {
  15     type Iter = I;
  16
  17     fn digit_iter(self) -> I {
  18         self
  19     }
  20 }
  21
  22 fn main() {
  23     let xs = vec![1, 2, 3, 4, 5];
  24     assert_eq!(xs.into_iter().digit_sum(), 15);
  25 }