{
case OP_operation:
if (op->operation == OP_return_number)
fprintf (stderr, "return_number");
else if (op->operation == OP_return_string)
fprintf (stderr, "return_string");
{
case OP_operation:
if (op->operation == OP_return_number)
fprintf (stderr, "return_number");
else if (op->operation == OP_return_string)
fprintf (stderr, "return_string");