public Parser threadLocalClause() {
        if (threadLocalClauseParser == null) {
           FutureParser future = scoped("threadLocalClause");
           threadLocalClauseParser = future;
           future.setParser(
               sequence(
                   optional(
                       token("IS")
                   ),
                   token("THREAD-LOCAL")
               )
           );
        }

        return threadLocalClauseParser;
    }