Merge pull request #1465 from mautamu/patch-1

Close #1464
rust-lang · Oct 1, 2021 · 111e468 · 111e468
2 parents 724aecc + 5030b35
commit 111e468
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/trait/impl_trait.md b/src/trait/impl_trait.md
@@ -68,4 +68,10 @@ fn double_positives<'a>(numbers: &'a Vec<i32>) -> impl Iterator<Item = i32> + 'a
         .filter(|x| x > &&0)
         .map(|x| x * 2)
 }
+
+fn main() {
+    let singles = vec![-3, -2, 2, 3];
+    let doubles = double_positives(&singles);
+    assert_eq!(doubles.collect::<Vec<i32>>(), vec![4, 6]);
+}
 ```