https://git.ruby-lang.org/ruby.git/commit/?id=7fa86de15b

From 7fa86de15b2a8aa85919f4aa76e86acbb9a43564 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 12 Aug 2020 13:15:29 +0900
Subject: [ruby/irb] Workaround a bug of ruby-mode.el

https://github.com/ruby/irb/commit/6dfd59400d

diff --git a/lib/irb/ext/save-history.rb b/lib/irb/ext/save-history.rb
index 7ba1237..ac358c8 100644
--- a/lib/irb/ext/save-history.rb
+++ b/lib/irb/ext/save-history.rb
@@ -25,7 +25,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/ext/save-history.rb#L25
       IRB.conf[:SAVE_HISTORY]
     end
 
-    remove_method :save_history= if method_defined?(:save_history=)
+    remove_method(:save_history=) if method_defined?(:save_history=)
     # Sets <code>IRB.conf[:SAVE_HISTORY]</code> to the given +val+ and calls
     # #init_save_history with this context.
     #
-- 
cgit v0.10.2


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