defines Rails.autoloaders.log!

railties/lib/rails/autoloaders.rb

@@ -36,6 +36,10 @@ def logger=(logger)
         each { |loader| loader.logger = logger }
       end
 
+      def log!
+        each(&:log!)
+      end
+
       def zeitwerk_enabled?
         Rails.configuration.autoloader == :zeitwerk
       end

railties/test/application/zeitwerk_integration_test.rb

@@ -385,4 +385,16 @@ def once_autoloader.reload
       assert_nil autoloader.logger
     end
   end
+
+  test "autoloaders.log!" do
+    app_file "extras/utils.rb", "module Utils; end"
+
+    add_to_config %(config.autoload_once_paths << "\#{Rails.root}/extras")
+    add_to_config "Rails.autoloaders.log!"
+
+    out, _err = capture_io { boot }
+
+    assert_match %r/^Zeitwerk@rails.main: autoload set for ApplicationRecord/, out
+    assert_match %r/^Zeitwerk@rails.once: autoload set for Utils/, out
+  end
 end