From a50811a214b50d4a835ba1ad8eac546f9c7af9fa Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Thu, 30 Jul 2020 12:11:30 -0700
Subject: [PATCH] Add safety note to library/std/src/sys/unix/fd.rs

Co-authored-by: Elichai Turkel <elichai.turkel@gmail.com>
---
 library/std/src/sys/unix/fd.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/library/std/src/sys/unix/fd.rs b/library/std/src/sys/unix/fd.rs
index 0eeaa68d55a7d..08c63444e2bb6 100644
--- a/library/std/src/sys/unix/fd.rs
+++ b/library/std/src/sys/unix/fd.rs
@@ -69,6 +69,7 @@ const fn max_iov() -> usize {
 impl FileDesc {
     pub fn new(fd: c_int) -> FileDesc {
         assert_ne!(fd, -1);
+        // SAFETY: we just asserted that the value is in the valid range and isn't `-1` (the only value bigger than `0xFF_FF_FF_FE` unsigned)
         unsafe { FileDesc { fd } }
     }