Add missing use clauses
@@ -9,6 +9,11 @@ use std::fmt::{self, Debug};
/// # Examples
///
/// ```
+/// use rayon::iter;
+/// use rayon::prelude::*;
+/// use std::ops::Range;
+///
+///
/// // This is a range of bi-dimensional indices
/// #[derive(Debug)]
/// struct Range2D {
