From 4562dad94c6af3db5af8704b0aec64119456275d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 28 Jun 2019 12:36:03 +0900
Subject: [PATCH] Removed unused variable

---
 tool/mkconfig.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tool/mkconfig.rb b/tool/mkconfig.rb
index edfdda203b..586eb9ec59 100755
--- a/tool/mkconfig.rb
+++ b/tool/mkconfig.rb
@@ -347,7 +347,7 @@ print <<EOS
   #
   # returns updated keys list, or +nil+ if nothing changed.
   def RbConfig.fire_update!(key, val, mkconf = MAKEFILE_CONFIG, conf = CONFIG)
-    return if (old = mkconf[key]) == val
+    return if mkconf[key] == val
     mkconf[key] = val
     keys = [key]
     deps = []