From f93d5d30bd0d141f7c5acabb5d612897eaf83303 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Fri, 6 Apr 2018 18:03:23 -0400
Subject: [PATCH] add useful debug

---
 src/librustc_mir/borrow_check/mod.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/librustc_mir/borrow_check/mod.rs b/src/librustc_mir/borrow_check/mod.rs
index e4a4360a8051..7c5f0b97f713 100644
--- a/src/librustc_mir/borrow_check/mod.rs
+++ b/src/librustc_mir/borrow_check/mod.rs
@@ -843,6 +843,14 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
         rw: ReadOrWrite,
         flow_state: &Flows<'cx, 'gcx, 'tcx>,
     ) -> bool {
+        debug!(
+            "check_access_for_conflict(context={:?}, place_span={:?}, sd={:?}, rw={:?})",
+            context,
+            place_span,
+            sd,
+            rw,
+        );
+
         let mut error_reported = false;
         self.each_borrow_involving_path(
             context,