From 42b10e51c18ad37f671dc289aa0f183d4dbceab9 Mon Sep 17 00:00:00 2001
From: Kornel <kornel@geekhood.net>
Date: Tue, 24 Mar 2020 13:33:35 +0000
Subject: must_use on split_off

#70194
---
 src/liballoc/string.rs | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/liballoc/string.rs')

diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index 0e48f1548e6..7c89d38caa4 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -1461,6 +1461,7 @@ impl String {
     /// ```
     #[inline]
     #[stable(feature = "string_split_off", since = "1.16.0")]
+    #[must_use = "use `.truncate()` if you don't need the other half"]
     pub fn split_off(&mut self, at: usize) -> String {
         assert!(self.is_char_boundary(at));
         let other = self.vec.split_off(at);
-- 
cgit 1.4.1-3-g733a5