From 0ce96bdcfad27bcfc171afe37b105e02cd82cf61 Mon Sep 17 00:00:00 2001
From: Will Crichton <wcrichto@cs.stanford.edu>
Date: Tue, 17 Aug 2021 20:55:15 -0700
Subject: [PATCH] Fix bug in fmt_diff_with

---
 compiler/rustc_mir/src/dataflow/framework/fmt.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_mir/src/dataflow/framework/fmt.rs b/compiler/rustc_mir/src/dataflow/framework/fmt.rs
index 0140a750544..35115ca9db7 100644
--- a/compiler/rustc_mir/src/dataflow/framework/fmt.rs
+++ b/compiler/rustc_mir/src/dataflow/framework/fmt.rs
@@ -33,7 +33,7 @@ pub trait DebugWithContext<C>: Eq + fmt::Debug {
         }
 
         write!(f, "\u{001f}-")?;
-        self.fmt_with(ctxt, f)
+        old.fmt_with(ctxt, f)
     }
 }