From 1a461598280f3f0ed047c89d1f2ec10be354e609 Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Sun, 19 Apr 2020 01:03:43 +0900
Subject: [PATCH] Explain why we shouldn't add inline attr to into_vec

---
 src/liballoc/slice.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/liballoc/slice.rs b/src/liballoc/slice.rs
index c13e90a3d7081..53477288b59ee 100644
--- a/src/liballoc/slice.rs
+++ b/src/liballoc/slice.rs
@@ -140,6 +140,9 @@ mod hack {
     use crate::string::ToString;
     use crate::vec::Vec;
 
+    // We shouldn't add inline attribute to this since this is used in
+    // `vec!` macro mostly and causes perf regression. See #71204 for
+    // discussion and perf results.
     pub fn into_vec<T>(b: Box<[T]>) -> Vec<T> {
         unsafe {
             let len = b.len();