Fix tests for Rust 1.19 (sans NLL)

Author: cuviper

src/lib.rs

@@ -2478,8 +2478,10 @@ mod test {
     #[test]
     fn map_deref_mut() {
         let mut items = [1, 2, 3];
-        let it = convert_mut(&mut items).map_deref_mut(|i| -core::mem::replace(i, 0));
-        test_deref(it, &[-1, -2, -3]);
+        {
+            let it = convert_mut(&mut items).map_deref_mut(|i| -core::mem::replace(i, 0));
+            test_deref(it, &[-1, -2, -3]);
+        }
         assert_eq!(items, [0, 0, 0]);
     }
 

src/sources.rs

@@ -50,12 +50,14 @@ where
 /// ```
 /// # use streaming_iterator::{StreamingIteratorMut, convert_mut};
 /// let mut scores = vec![Some(100), None, Some(80)];
-/// let mut streaming_iter = convert_mut(&mut scores);
-/// while let Some(opt_score) = streaming_iter.next_mut() {
-///     if let Some(score) = opt_score.take() {
-///         println!("The score is: {}", score);
+/// {
+///     let mut streaming_iter = convert_mut(&mut scores);
+///     while let Some(opt_score) = streaming_iter.next_mut() {
+///         if let Some(score) = opt_score.take() {
+///             println!("The score is: {}", score);
+///         }
+///         // else already reported
 ///     }
-///     // else already reported
 /// }
 /// assert_eq!(scores, [None, None, None]);
 /// ```