lowpan.patch

diff --git a/third_party/rust_crates/vendor/futures-util/src/stream/select.rs b/third_party/rust_crates/vendor/futures-util/src/stream/select.rs
index 133ac6c7ac0..58d71fe1df3 100644
--- a/third_party/rust_crates/vendor/futures-util/src/stream/select.rs
+++ b/third_party/rust_crates/vendor/futures-util/src/stream/select.rs
@@ -94,16 +94,16 @@ where
 
     fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<St1::Item>> {
         let this = self.project();
-        if !*this.flag {
-            poll_inner(this.flag, this.stream1, this.stream2, cx)
+        // give the other stream a chance to go first next time
+        if !std::mem::replace(this.flag, !*this.flag) {
+            poll_inner(this.stream1, this.stream2, cx)
         } else {
-            poll_inner(this.flag, this.stream2, this.stream1, cx)
+            poll_inner(this.stream2, this.stream1, cx)
         }
     }
 }
 
 fn poll_inner<St1, St2>(
-    flag: &mut bool,
     a: Pin<&mut St1>,
     b: Pin<&mut St2>,
     cx: &mut Context<'_>,
@@ -114,8 +114,6 @@ where
 {
     let a_done = match a.poll_next(cx) {
         Poll::Ready(Some(item)) => {
-            // give the other stream a chance to go first next time
-            *flag = !*flag;
             return Poll::Ready(Some(item));
         }
         Poll::Ready(None) => true,