anchor.diff:  			     arity_qualifier(
   			       set_pos(atom(Atom), Pos),
   			       set_pos(integer(Arity), Pos)));
  -	{'fun', Pos, {function, Module, Atom, Arity}} ->
  +	{'fun', _Pos, {function, Module, Atom, Arity}} ->
               module_qualifier(Module, arity_qualifier(Atom, Arity));
   	Node1 ->
   	    data(Node1)
  
positive.code: 		revert_list_comp(Node);
  	     match_expr -> 
  		revert_match_expr(Node);
  	     module_qualifier -> 
  		revert_module_qualifier(Node);
  	     nil -> 
  
negative.code: 	    try_expr ->
  		[try_expr_body(T), try_expr_clauses(T),
  		 try_expr_handlers(T), try_expr_after(T)];
              map ->
                  [map_elements(T)];
              map_field_assoc ->
  		    [map_field_elements(T)];
  	    map_field_exact ->
  		    [map_field_elements(T)];
  	    tuple -> [tuple_elements(T)];
  	    type -> [];
              empty_node -> [];
  