cgen: fix comptime for method with $method as inherited var
#2320
| Job | Run time |
|---|---|
| 1m 51s | |
| 1m 52s | |
| 3m 43s |
$method as inherited var
#2320
| Job | Run time |
|---|---|
| 1m 51s | |
| 1m 52s | |
| 3m 43s |