From e6aa4b8033417732e2906bd9fdb8eec976f92c3d Mon Sep 17 00:00:00 2001
From: Santiago Pastorino <spastorino@gmail.com>
Date: Sat, 25 May 2019 22:28:15 +0200
Subject: [PATCH] Add comment to explain why we change the layout for
 Projection

---
 src/librustc_mir/interpret/operand.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/librustc_mir/interpret/operand.rs b/src/librustc_mir/interpret/operand.rs
index e26b147ea581d..de788a22886ab 100644
--- a/src/librustc_mir/interpret/operand.rs
+++ b/src/librustc_mir/interpret/operand.rs
@@ -475,6 +475,8 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> InterpretCx<'a, 'mir, 'tcx, M>
                 PlaceBase::Local(mir::RETURN_PLACE) => return err!(ReadFromReturnPointer),
                 PlaceBase::Local(local) => {
                     // FIXME use place_projection.is_empty() when is available
+                    // Do not use the layout passed in as argument if the base we are looking at
+                    // here is not the entire place.
                     let layout = if let Place::Base(_) = mir_place {
                         layout
                     } else {