class Rules extends RuleSource {
            @Model
            void fss(FunctionalSourceSet sources) {
            }

            @Mutate void printTask(ModelMap<Task> tasks, FunctionalSourceSet sources) {
                tasks.create("printTask") {
                    doLast {
                        println "name: " + sources.name
                        println "display-name: " + sources.displayName

        buildFile '''
            abstract class PrintTask extends DefaultTask {
                @OutputFile
                abstract RegularFileProperty getOutput()

                @TaskAction
                def action() {
                    output.get().asFile.text = "Hello"
                }
            }

            def printTask = tasks.register('print', PrintTask) {

            class MyPlugin {
                static class Rules extends RuleSource {
                    @Mutate void addPrintTask(ModelMap<Task> tasks, List<String> strings) {
                        tasks.create("printMessage", PrintTask) {
                            it.message = strings
                        }
                    }

                    @Model String foo() {
                        "foo"
                    }