https://git.ruby-lang.org/ruby.git/commit/?id=39322317f3

From 39322317f3442e71a997503059fb644f31e0ea3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Josef=20=C5=A0im=C3=A1nek?= <josef.simanek@g...>
Date: Thu, 23 Apr 2020 09:03:11 +0200
Subject: [rubygems/rubygems] Do not use set.

https://github.com/rubygems/rubygems/commit/1a72c8796f

diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index eb62287..a153286 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -6,7 +6,6 @@ https://github.com/ruby/ruby/blob/trunk/lib/rubygems/specification.rb#L6
 # See LICENSE.txt for permissions.
 #++
 
-require 'set'
 require 'rubygems/version'
 require 'rubygems/requirement'
 require 'rubygems/platform'
@@ -197,7 +196,7 @@ class Gem::Specification < Gem::BasicSpecification https://github.com/ruby/ruby/blob/trunk/lib/rubygems/specification.rb#L196
   # Tracking removed method calls to warn users during build time.
   REMOVED_METHODS = [:rubyforge_project=].freeze # :nodoc:
   def removed_method_calls
-    @removed_method_calls ||= Set.new
+    @removed_method_calls ||= []
   end
 
   ######################################################################
-- 
cgit v0.10.2


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