checker: fix missing option variable checking when casting using as operator
#4160
| Job | Run time |
|---|---|
| 1m 40s | |
| 1m 33s | |
| 3m 13s |
as operator
#4160
| Job | Run time |
|---|---|
| 1m 40s | |
| 1m 33s | |
| 3m 13s |