- tmp = frame->filename;
- if (tmp != NULL) {
- os << "at " << tmp->toString();
- tmp = frame->linenumber;
- if (tmp != NULL) {
- os << ":" << tmp->toString() << " ";
+ if (frame->filename != NULL) {
+ os << "at " << frame->filename;
+ if (frame->linenumber >= 0) {
+ os << ":" << frame->linenumber << " ";