Maybe fix ruby-core?

bundler/spec/commands/install_spec.rb

@@ -216,6 +216,18 @@
       expect(the_bundle).to include_gems "rack 1.0.0", "activesupport 2.3.5"
     end
 
+    it "loads env plugins" do
+      plugin_msg = "hello from an env plugin!"
+      create_file "plugins/rubygems_plugin.rb", "puts '#{plugin_msg}'"
+      puts ENV["RUBYLIB"]
+      install_gemfile <<-G, :env => { "RUBYLIB" => "#{bundled_app("plugins/")}:#{ENV["RUBYLIB"]}" }
+        source "#{file_uri_for(gem_repo1)}"
+        gem "rack"
+      G
+
+      expect(last_command.stdboth).to include(plugin_msg)
+    end
+
     describe "with a gem that installs multiple platforms" do
       it "installs gems for the local platform as first choice" do
         skip "version is 1.0, not 1.0.0" if Gem.win_platform?
@@ -432,16 +444,6 @@
         gem 'foo'
       G
     end
-
-    it "loads env plugins" do
-      plugin_msg = "hello from an env plugin!"
-      create_file "plugins/rubygems_plugin.rb", "puts '#{plugin_msg}'"
-      install_gemfile <<-G, :env => { "RUBYLIB" => bundled_app("plugins/").to_s }
-        source "#{file_uri_for(gem_repo1)}"
-        gem 'foo'
-      G
-      expect(last_command.stdboth).to include(plugin_msg)
-    end
   end
 
   describe "Ruby version in Gemfile.lock" do