https://git.ruby-lang.org/ruby.git/commit/?id=fcc36d767b

From fcc36d767b60329692b27d685ba867848da6aa04 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Thu, 6 Jun 2019 16:49:40 +0900
Subject: Revert "Stop `circular require` warning"

This reverts commit c2a9c350249588677cf68b506539093504927eac.

It cannot stop `circular require` warning.

diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index 33502f6..3508a1f 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -1207,7 +1207,7 @@ An Array (#{env.inspect}) was passed in from #{caller[3]} https://github.com/ruby/ruby/blob/trunk/lib/rubygems.rb#L1207
     ENV["BUNDLE_GEMFILE"] ||= File.expand_path(path)
     require 'rubygems/user_interaction'
     Gem::DefaultUserInteraction.use_ui(ui) do
-      require "bundler" unless caller_locations.any? { |location| location.path.end_with?("bundler.rb") }
+      require "bundler"
       begin
         @gemdeps = Bundler.setup
       ensure
-- 
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