From e632940a41fe6d65bd677da85d87046dc5da5022 Mon Sep 17 00:00:00 2001
From: Oliver Scherer <github35764891676564198441@oli-obk.de>
Date: Thu, 9 Jan 2020 10:56:05 +0100
Subject: [PATCH] Update src/librustc_mir/interpret/place.rs

Co-Authored-By: Ralf Jung <post@ralfj.de>
---
 src/librustc_mir/interpret/place.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/librustc_mir/interpret/place.rs b/src/librustc_mir/interpret/place.rs
index 6428caa8fb0ed..87bb4c04b73ac 100644
--- a/src/librustc_mir/interpret/place.rs
+++ b/src/librustc_mir/interpret/place.rs
@@ -182,6 +182,7 @@ impl<'tcx, Tag> MPlaceTy<'tcx, Tag> {
     pub fn dangling(layout: TyLayout<'tcx>, cx: &impl HasDataLayout) -> Self {
         let align = layout.align.abi;
         let ptr = Scalar::from_uint(align.bytes(), cx.pointer_size());
+        // `Poison` this to make sure that the pointer value `ptr` is never observable by the program.
         MPlaceTy { mplace: MemPlace { ptr, align, meta: MemPlaceMeta::Poison }, layout }
     }