code: public final void mRULE_EMPTY_PAREN() throws RecognitionException {
          try {
              int _type = RULE_EMPTY_PAREN;
              int _channel = DEFAULT_TOKEN_CHANNEL;
              // InternalSimpleAntlr.g:1728:18: ( RULE_OPEN ')' )
              // InternalSimpleAntlr.g:1728:20: RULE_OPEN ')'
              {
              mRULE_OPEN(); 
              match(')'); 
  
              }
  
              state.type = _type;
              state.channel = _channel;
          }
          finally {
          }
      }
docs: $ANTLR start "RULE_EMPTY_PAREN"