From abfd02e255702a57e6d4534b01ddd169d067e45a Mon Sep 17 00:00:00 2001
From: faraz <faraz.shaikh@gmail.com>
Date: Thu, 11 Mar 2021 19:20:43 -0800
Subject: [PATCH] Issue 3608

EnterGuard must always be used.

  {
    let _guard = handle.enter(); // skipping _guard is wrong in all likelihood
  }
---
 tokio/src/runtime/handle.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs
index 76b28f24e36..5de23669b82 100644
--- a/tokio/src/runtime/handle.rs
+++ b/tokio/src/runtime/handle.rs
@@ -39,6 +39,7 @@ pub struct Handle {
 ///
 /// [`Runtime::enter`]: fn@crate::runtime::Runtime::enter
 #[derive(Debug)]
+#[must_use = "Creating and dropping a guard does nothing"]
 pub struct EnterGuard<'a> {
     handle: &'a Handle,
     guard: context::EnterGuard,