From 351782d30aaa6e15204e17ecdd51ac1e712685cf Mon Sep 17 00:00:00 2001
From: Amos Onn <amosonn@gmail.com>
Date: Fri, 31 Jan 2020 15:18:27 +0100
Subject: [PATCH] Improve #Safety of core::ptr::replace

Added missing condition:
`dst` must be readable
---
 src/libcore/ptr/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcore/ptr/mod.rs b/src/libcore/ptr/mod.rs
index d465ab11c55da..7faede4402031 100644
--- a/src/libcore/ptr/mod.rs
+++ b/src/libcore/ptr/mod.rs
@@ -471,7 +471,7 @@ unsafe fn swap_nonoverlapping_bytes(x: *mut u8, y: *mut u8, len: usize) {
 ///
 /// Behavior is undefined if any of the following conditions are violated:
 ///
-/// * `dst` must be [valid] for writes.
+/// * `dst` must be [valid] for both reads and writes.
 ///
 /// * `dst` must be properly aligned.
 ///