Hi Dan,
I like to report a bug find about wal2.
call sqlite3_database_file_object from xOpen get this:
```c
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x48)
frame #0: 0x0000000100056459 tests_db_bench.exe`sqlite3_database_file_object(zName="/private/tmp/test.db-wal2") at sqlite3c.h:56776:18
56773 zName--;
56774 }
56775 pPager = *(Pager**)(zName - 4 - sizeof(Pager*));
-> 56776 return pPager->fd;
56777 }
56778
56779
Target 0: (tests_db_bench.exe) stopped.
```