From 66a651244ee810d9027c0ff2266a097d9aa06b59 Mon Sep 17 00:00:00 2001
From: Tim Diekmann <tim.diekmann@3dvision.de>
Date: Tue, 18 Aug 2020 10:00:31 +0200
Subject: [PATCH] Add comment, which was removed by accident (again)

---
 library/std/src/alloc.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/library/std/src/alloc.rs b/library/std/src/alloc.rs
index 6121063504f..bc895640fd2 100644
--- a/library/std/src/alloc.rs
+++ b/library/std/src/alloc.rs
@@ -187,6 +187,8 @@ impl System {
     }
 }
 
+// The AllocRef impl checks the layout size to be non-zero and forwards to the GlobalAlloc impl,
+// which is in `std::sys::*::alloc`.
 #[unstable(feature = "allocator_api", issue = "32838")]
 unsafe impl AllocRef for System {
     #[inline]