Skeleton cycle

src/stream/stream/cycle.rs

@@ -0,0 +1,20 @@
+use std::pin::Pin;
+
+use pin_project_lite::pin_project;
+
+use crate::stream::Stream;
+use crate::task::{Context, Poll};
+
+/// A stream that will repeatedly yield the same list of elements
+pub struct Cycle<T> {
+    source: Vec<T>,
+    index: usize,
+}
+
+impl<T: Copy> Stream for Cycle<T> {
+    type Item = T;
+
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}

src/stream/stream/mod.rs

@@ -24,9 +24,10 @@
 mod all;
 mod any;
 mod chain;
-mod cmp;
-mod copied;
 mod enumerate;
+mod cycle;
+mod copied;
+mod cmp;
 mod eq;
 mod filter;
 mod filter_map;