Fix intersperse_fold

2 files changed, 31 insertions, 3 deletions

diff --git a/library/core/src/iter/adapters/intersperse.rs b/library/core/src/iter/adapters/intersperse.rs
index 1d01e9b5fb7..2143509d71d 100644
--- a/library/core/src/iter/adapters/intersperse.rs
+++ b/library/core/src/iter/adapters/intersperse.rs
@@ -160,7 +160,7 @@ where
 }
 
 fn intersperse_fold<I, B, F, G>(
-    mut iter: Peekable<I>,
+    mut iter: I,
     init: B,
     mut f: F,
     mut separator: G,
@@ -173,8 +173,7 @@ where
 {
     let mut accum = init;
 
-    // Use `peek()` first to avoid calling `next()` on an empty iterator.
-    if !needs_sep || iter.peek().is_some() {
+    if !needs_sep {
         if let Some(x) = iter.next() {
             accum = f(accum, x);
         }
diff --git a/library/core/tests/iter.rs b/library/core/tests/iter.rs
index bc5421bfb5f..fa259e68a43 100644
--- a/library/core/tests/iter.rs
+++ b/library/core/tests/iter.rs
@@ -3563,6 +3563,35 @@ fn test_intersperse_size_hint() {
 }
 
 #[test]
+fn test_intersperse_fold() {
+    let v = (1..4).intersperse(9).fold(Vec::new(), |mut acc, x| {
+        acc.push(x);
+        acc
+    });
+    assert_eq!(v.as_slice(), [1, 9, 2, 9, 3]);
+
+    let mut iter = (1..4).intersperse(9);
+    assert_eq!(iter.next(), Some(1));
+    let v = iter.fold(Vec::new(), |mut acc, x| {
+        acc.push(x);
+        acc
+    });
+    assert_eq!(v.as_slice(), [9, 2, 9, 3]);
+}
+
+#[test]
+fn test_intersperse_collect_string() {
+    let contents = vec![1, 2, 3];
+
+    let contents_string = contents
+        .into_iter()
+        .map(|id| id.to_string())
+        .intersperse(", ".to_owned())
+        .collect::<String>();
+    assert_eq!(contents_string, "1, 2, 3");
+}
+
+#[test]
 fn test_fold_specialization_intersperse() {
     let mut iter = (1..2).intersperse(0);
     iter.clone().for_each(|x| assert_eq!(Some(x), iter.next()));