public Parser acceptFromMnemonic() {
        if (acceptFromMnemonicParser == null) {
           FutureParser future = scoped("acceptFromMnemonic");
           acceptFromMnemonicParser = future;
           future.setParser(
               sequence(
                   identifier_format2(),
                   token("FROM"),
                   mnemonicName(),
                   optional(
                       choice(
                           onException(),
                           onEscape()
                       )
                   ),
                   optional(
                       choice(
                           notOnException(),
                           notOnEscape()
                       )
                   )
               )
           );
        }

        return acceptFromMnemonicParser;
    }