https://git.ruby-lang.org/ruby.git/commit/?id=4b6e3f7b82

From 4b6e3f7b82e03d6eb6562631365d35abaee35fb3 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 20 Dec 2020 19:35:59 +0900
Subject: irb: Define extension command on the given object


diff --git a/lib/irb/extend-command.rb b/lib/irb/extend-command.rb
index 02b7869..3473232 100644
--- a/lib/irb/extend-command.rb
+++ b/lib/irb/extend-command.rb
@@ -177,9 +177,9 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/extend-command.rb#L177
             args << "&block"
             args = args.join(", ")
             line = __LINE__; eval %[
-              unless self.singleton_class.class_variable_defined?(:@@#{cmd_name}_)
-                self.singleton_class.class_variable_set(:@@#{cmd_name}_, true)
-                def #{cmd_name}_(\#{args})
+              unless singleton_class.class_variable_defined?(:@@#{cmd_name}_)
+                singleton_class.class_variable_set(:@@#{cmd_name}_, true)
+                def self.#{cmd_name}_(\#{args})
                   ExtendCommand::#{cmd_class}.execute(irb_context, \#{args})
                 end
               end
-- 
cgit v0.10.2


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