From 38050c3370a39180b9431cf9a9f2cac1886a9b19 Mon Sep 17 00:00:00 2001
From: Marek Kuskowski <50183564+nylonicious@users.noreply.github.com>
Date: Thu, 28 Sep 2023 23:01:44 +0200
Subject: [PATCH] io: mark Interest::add as must_use

---
 tokio/src/io/interest.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs
index cf6d270e0c6..e823910d1b6 100644
--- a/tokio/src/io/interest.rs
+++ b/tokio/src/io/interest.rs
@@ -163,6 +163,7 @@ impl Interest {
     ///
     /// assert!(BOTH.is_readable());
     /// assert!(BOTH.is_writable());
+    #[must_use = "this returns the result of the operation, without modifying the original"]
     pub const fn add(self, other: Interest) -> Interest {
         Self(self.0 | other.0)
     }