public Parser notAtEnd() {
        if (notAtEndParser == null) {
           FutureParser future = scoped("notAtEnd");
           notAtEndParser = future;
           future.setParser(
               sequence(
                   token("NOT"),
                   optional(
                       token("AT")
                   ),
                   token("END"),
                   nestedStatements()
               )
           );
        }

        return notAtEndParser;
    }