https://git.ruby-lang.org/ruby.git/commit/?id=8ee24840c8

From 8ee24840c844a25c749e7e69017e5a2331c49c1c Mon Sep 17 00:00:00 2001
From: Keiko Kaneko <keiko.cda@g...>
Date: Tue, 29 Jun 2021 21:29:22 +0900
Subject: [ruby/irb] Update ls.rb without requiring Set, because Set is one of
 standard libraries

https://github.com/ruby/irb/commit/7092ad2ab5
---
 lib/irb/cmd/ls.rb | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/irb/cmd/ls.rb b/lib/irb/cmd/ls.rb
index 1809264..cbbf962 100644
--- a/lib/irb/cmd/ls.rb
+++ b/lib/irb/cmd/ls.rb
@@ -1,7 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/lib/irb/cmd/ls.rb#L1
 # frozen_string_literal: true
 
 require "reline"
-require 'set'
 require_relative "nop"
 require_relative "../color"
 
@@ -33,9 +32,11 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/cmd/ls.rb#L32
       end
 
       def class_method_map(classes)
-        dumped = Set.new
+        dumped = Array.new
         classes.reject { |mod| mod >= Object }.map do |mod|
-          methods = mod.public_instance_methods(false).select { |m| dumped.add?(m) }
+          methods = mod.public_instance_methods(false).select do |m|
+            dumped.push(m) unless dumped.include?(m)
+          end
           [mod, methods]
         end.reverse
       end
-- 
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