[ruby/irb] Update ls.rb without requiring Set, because Set is one of standard libraries

https://github.com/ruby/irb/commit/7092ad2ab5

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/irb/cmd/ls.rb b/lib/irb/cmd/ls.rb
index 18092642d7..cbbf96210e 100644
--- a/lib/irb/cmd/ls.rb
+++ b/lib/irb/cmd/ls.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "reline"
-require 'set'
 require_relative "nop"
 require_relative "../color"
 
@@ -33,9 +32,11 @@ module IRB
       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