From 5311b2d54af095f53cf2566ef8f2451e4d46cb40 Mon Sep 17 00:00:00 2001
From: tison <wander4096@gmail.com>
Date: Mon, 3 Nov 2025 00:02:27 +0800
Subject: [PATCH] Avoid copy when convert owned String to Arc<str>

Signed-off-by: tison <wander4096@gmail.com>
---
 library/alloc/src/sync.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs
index 13b5cf23e72d8..b35beba54eca4 100644
--- a/library/alloc/src/sync.rs
+++ b/library/alloc/src/sync.rs
@@ -3878,7 +3878,7 @@ impl From<&mut str> for Arc<str> {
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "shared_from_slice", since = "1.21.0")]
 impl From<String> for Arc<str> {
-    /// Allocates a reference-counted `str` and copies `v` into it.
+    /// Converts the given [`String`] to a shared reference-counted `str` slice.
     ///
     /// # Example
     ///
@@ -3890,7 +3890,7 @@ impl From<String> for Arc<str> {
     /// ```
     #[inline]
     fn from(v: String) -> Arc<str> {
-        Arc::from(&v[..])
+        Arc::from(v.into_boxed_str())
     }
 }