classpath = plusExtensionModules(classpath, extensionModules, coreModules);
        }
        for (String moduleName : GRADLE_OPTIONAL_EXTENSION_MODULES) {
            Set<Module> optionalExtensionModules = allRequiredModulesOfOptional(moduleName);
            classpath = plusExtensionModules(classpath, optionalExtensionModules, coreModules);
        }
        for (Module pluginModule : pluginModuleRegistry.getApiModules()) {