Update src/librustc_mir/interpret/place.rs

Co-Authored-By: Ralf Jung <post@ralfj.de>
rust-lang · Jan 9, 2020 · e632940 · e632940
1 parent d0b24e5
commit e632940
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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 }
     }