https://git.ruby-lang.org/ruby.git/commit/?id=9042787508

From 90427875085f480c4c8e02d4252804cac29d7aaa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Wed, 8 Apr 2020 21:10:33 +0200
Subject: [rubygems/rubygems] Remove unnecessary `@@ruby` variable

https://github.com/rubygems/rubygems/commit/5f20647ec1

diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
index f1f6b85..b4d8db3 100644
--- a/lib/rubygems/test_case.rb
+++ b/lib/rubygems/test_case.rb
@@ -1220,7 +1220,7 @@ Also, a list: https://github.com/ruby/ruby/blob/trunk/lib/rubygems/test_case.rb#L1220
 
   def build_rake_in(good=true)
     gem_ruby = Gem.ruby
-    Gem.ruby = @@ruby
+    Gem.ruby = self.class.rubybin
     env_rake = ENV["rake"]
     rake = (good ? @@good_rake : @@bad_rake)
     ENV["rake"] = rake
@@ -1289,7 +1289,6 @@ Also, a list: https://github.com/ruby/ruby/blob/trunk/lib/rubygems/test_case.rb#L1289
 
   end
 
-  @@ruby = rubybin
   @@good_rake = "#{rubybin} #{escape_path(TEST_PATH, 'good_rake.rb')}"
   @@bad_rake = "#{rubybin} #{escape_path(TEST_PATH, 'bad_rake.rb')}"
 
diff --git a/test/rubygems/test_gem_ext_rake_builder.rb b/test/rubygems/test_gem_ext_rake_builder.rb
index 1b5993c..9d78917 100644
--- a/test/rubygems/test_gem_ext_rake_builder.rb
+++ b/test/rubygems/test_gem_ext_rake_builder.rb
@@ -26,7 +26,7 @@ class TestGemExtRakeBuilder < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_ext_rake_builder.rb#L26
       output = output.join "\n"
 
       refute_match %r{^rake failed:}, output
-      assert_match %r{^#{Regexp.escape @@ruby} mkrf_conf\.rb}, output
+      assert_match %r{^#{Regexp.escape Gem.ruby} mkrf_conf\.rb}, output
       assert_match %r{^#{Regexp.escape rake} RUBYARCHDIR\\=#{Regexp.escape @dest_path} RUBYLIBDIR\\=#{Regexp.escape @dest_path}}, output
     end
   end
@@ -47,7 +47,7 @@ class TestGemExtRakeBuilder < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_ext_rake_builder.rb#L47
       output = output.join "\n"
 
       refute_match %r{^rake failed:}, output
-      assert_match %r{^#{Regexp.escape @@ruby} mkrf_conf\.rb}, output
+      assert_match %r{^#{Regexp.escape Gem.ruby} mkrf_conf\.rb}, output
       assert_match %r{^#{Regexp.escape rake} RUBYARCHDIR\\=#{Regexp.escape @dest_path} RUBYLIBDIR\\=#{Regexp.escape @dest_path}}, output
     end
   end
diff --git a/test/rubygems/test_require.rb b/test/rubygems/test_require.rb
index 7b071ba..e6c69c8 100644
--- a/test/rubygems/test_require.rb
+++ b/test/rubygems/test_require.rb
@@ -523,11 +523,11 @@ class TestGemRequire < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_require.rb#L523
           File.write(dir + "/sub.rb", "#{prefix}warn 'uplevel', 'test', uplevel: 1\n")
           File.write(dir + "/main.rb", "require 'sub'\n")
           _, err = capture_subprocess_io do
-            system(@@ruby, "-w", "--disable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
+            system(Gem.ruby, "-w", "--disable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
           end
           assert_match(/main\.rb:1: warning: uplevel\ntest\n$/, err)
           _, err = capture_subprocess_io do
-            system(@@ruby, "-w", "--enable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
+            system(Gem.ruby, "-w", "--enable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
           end
           assert_match(/main\.rb:1: warning: uplevel\ntest\n$/, err)
         end
@@ -538,11 +538,11 @@ class TestGemRequire < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_require.rb#L538
         Dir.mktmpdir("warn_test") do |dir|
           File.write(dir + "/main.rb", "#{prefix}warn({x:1}, {y:2}, [])\n")
           _, err = capture_subprocess_io do
-            system(@@ruby, "-w", "--disable=gems", "-I", lib, "-C", dir, "main.rb")
+            system(Gem.ruby, "-w", "--disable=gems", "-I", lib, "-C", dir, "main.rb")
           end
           assert_match(/{:x=>1}\n{:y=>2}\n$/, err)
           _, err = capture_subprocess_io do
-            system(@@ruby, "-w", "--enable=gems", "-I", lib, "-C", dir, "main.rb")
+            system(Gem.ruby, "-w", "--enable=gems", "-I", lib, "-C", dir, "main.rb")
           end
           assert_match(/{:x=>1}\n{:y=>2}\n$/, err)
         end
-- 
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