From 87abe174c46bf10246369e63a36eccd6748b7dbe Mon Sep 17 00:00:00 2001
From: Alexis Bourget <alexis.bourget@gmail.com>
Date: Wed, 3 Jun 2020 23:55:41 +0200
Subject: [PATCH] Added a warning to CString::into_raw too

---
 src/libstd/ffi/c_str.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs
index 3d7ac724fbd5a..b324b1618966b 100644
--- a/src/libstd/ffi/c_str.rs
+++ b/src/libstd/ffi/c_str.rs
@@ -446,6 +446,11 @@ impl CString {
     ///
     /// Failure to call [`from_raw`] will lead to a memory leak.
     ///
+    /// The C side must **not** modify the length of the string (by writing a
+    /// `NULL` somewhere inside the string or removing the final one) before
+    /// it makes it back into Rust using [`from_raw`]. See the safety section
+    /// in [`from_raw`].
+    ///
     /// [`from_raw`]: #method.from_raw
     ///
     /// # Examples