anchor.diff:     ;
   
   opt_check_option
  -   : WITH CHECK OPTION
  -   | WITH CASCADED CHECK OPTION
  -   | WITH LOCAL CHECK OPTION
  +   : WITH (CASCADED | LOCAL)? CHECK OPTION
      |
      ;
   
  
positive.code: 
  /************************************************************************************************************************************************************/
  /*PL/SQL GRAMMAR */
     
     
  /*PLSQL grammar */
     
     /************************************************************************************************************************************************************/ pl_function
     : comp_options pl_block opt_semi
     ;
  
negative.code:    ;
  
  event_trigger_value_list
     : sconst (COMMA sconst)*
     ;
  
  altereventtrigstmt
  