From 1abed9cebf27f1f68e8711cb15ba9c2587b4da68 Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Mon, 7 May 2018 09:18:12 -0700
Subject: [PATCH] Add explanation for #[must_use] on Result

---
 src/libcore/result.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcore/result.rs b/src/libcore/result.rs
index c152d4979b9..e0cc669d035 100644
--- a/src/libcore/result.rs
+++ b/src/libcore/result.rs
@@ -251,7 +251,7 @@ use ops;
 /// [`Ok`]: enum.Result.html#variant.Ok
 /// [`Err`]: enum.Result.html#variant.Err
 #[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
-#[must_use]
+#[must_use = "this `Result` may be an `Err` variant, which should be handled"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Result<T, E> {
     /// Contains the success value