fix crash when prev_line is out of range #1186
| Job | Run time |
|---|---|
| 7m 3s | |
| 17s | |
| 7m 29s | |
| 5m 30s | |
| 5m 15s | |
| 6m 12s | |
| 5m 42s | |
| 6m 16s | |
| 3m 52s | |
| 4m 36s | |
| 4m 22s | |
| 4m 16s | |
| 4m 38s | |
| 6m 21s | |
| 3m 18s | |
| 4m 49s | |
| 3m 5s | |
| 4m 14s | |
| 4m 47s | |
| 4m 28s | |
| 3m 26s | |
| 3m 11s | |
| 5m 24s | |
| 3m 10s | |
| 4m 26s | |
| 3m 28s | |
| 4m 38s | |
| 3m 13s | |
| 4m 50s | |
| 3m 6s | |
| 4m 29s | |
| 3m 27s | |
| 4m 23s | |
| 2m 58s | |
| 3m 7s | |
| 2h 33m 46s |