Second example with zip

src/range.rs

@@ -19,6 +19,25 @@ use iter::internal::*;
 use std::ops::Range;
 
 /// Parallel iterator over a range
+/// Implemented for `u32`, `i32`, `usize` and `isize`.
+///
+/// ```
+/// use rayon::prelude::*;
+///
+/// let p = (0..25usize).into_par_iter()
+///                   .zip(0..25usize)
+///                   .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0)
+///                   .map(|(x, y)| x * y)
+///                   .fold(|| 0, |acc, cur| acc + cur)
+///                   .sum::<usize>();
+///
+/// let s = (0..25usize).zip(0..25)
+///                   .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0)
+///                   .map(|(x, y)| x * y)
+///                   .sum();
+///
+/// assert_eq!(p, s);
+/// ```
 #[derive(Debug)]
 pub struct Iter<T> {
     range: Range<T>,