anchor.diff:  ;
   
   table_factor1:
  -	table_factor2 (  (INNER | CROSS)? JOIN table_atom (join_condition)?  )?
  +	table_factor2 (  (INNER | CROSS)? JOIN table_atom (join_condition)? )?
   ;
   
   table_factor2:
  
positive.code: }
  
  @header {
  }
  
  stat:
  
negative.code: 	;
  
  table_references:
          table_reference ( (COMMA table_reference) | join_clause )*
  ;
  
  table_reference:
  