module NestedFunction {
    static String makeList(String separator) {
        Int counter = 1;

        function String(String) makeItem = item -> $"{counter++}{separator}{item}\n";

        return makeItem("first")
             + makeItem("second")
             + makeItem("third");
    }

    void run() {
        @Inject Console console;
        console.print(makeList(". "));
    }
}