anchor.diff:     ;
   
   generic_set
  -   : var_name (TO | EQUAL)var_list
  +   : var_name (TO | EQUAL) var_list
      ;
   
   set_rest_more
  
positive.code:    | select_with_parens indirection? # c_expr_expr
     | explicit_row # c_expr_expr
     | implicit_row # c_expr_expr
     ;
  
  plsqlvariablename
  
negative.code:    ;
  
  typename
     : simpletypename (opt_array_bounds | ARRAY (OPEN_BRACKET iconst CLOSE_BRACKET)?)
     | SETOF simpletypename (opt_array_bounds | ARRAY (OPEN_BRACKET iconst CLOSE_BRACKET)?)
     | qualified_name PERCENT (ROWTYPE | TYPE_P)
     ;
  
  