From f8e9d2f0ec1bd91e099e508044981d2cd51ec5f9 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sat, 29 Sep 2018 11:07:48 +0300
Subject: [PATCH] Fix Once perf regression

Because `call_once` is generic, but `is_completed` is not, we need
`#[inline]` annotation to allow LLVM to inline `is_completed` into
`call_once` in downstream crates.
---
 src/libstd/sync/once.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs
index ce54726baee2a..17cb614ba11ff 100644
--- a/src/libstd/sync/once.rs
+++ b/src/libstd/sync/once.rs
@@ -330,6 +330,7 @@ impl Once {
     /// assert_eq!(INIT.is_completed(), false);
     /// ```
     #[unstable(feature = "once_is_completed", issue = "42")]
+    #[inline]
     pub fn is_completed(&self) -> bool {
         // An `Acquire` load is enough because that makes all the initialization
         // operations visible to us, and, this being a fast path, weaker