From d11a6766ad388c97e3a95b26a9350ff4ddefd004 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 3 Dec 2018 10:26:39 +0100
Subject: [PATCH] use assert

---
 src/stacked_borrows.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/stacked_borrows.rs b/src/stacked_borrows.rs
index a90be317705a..41b5cc2a239d 100644
--- a/src/stacked_borrows.rs
+++ b/src/stacked_borrows.rs
@@ -322,9 +322,7 @@ impl<'tcx> Stack {
             }
             return;
         }
-        if self.frozen_since.is_some() {
-            bug!("Trying to create non-frozen reference to frozen location");
-        }
+        assert!(self.frozen_since.is_none(), "Trying to create non-frozen reference to frozen location");
 
         // Push new item to the stack.
         let itm = match bor {