AsyncInt::async_drop: 0
AsyncInt::async_drop: 1
AsyncInt::async_drop: 2
AsyncInt::async_drop: 3
AsyncInt::async_drop: 4
AsyncStruct::async_drop: 6
AsyncInt::async_drop: 7
AsyncInt::async_drop: 8
AsyncReference::async_drop: 10
AsyncInt::async_drop: 11
AsyncEnum(A)::async_drop: 12
SyncInt::drop: 12
AsyncEnum(B)::async_drop: 13
AsyncInt::async_drop: 13
SyncInt::drop: 14
SyncThenAsync::drop: 15
AsyncInt::async_drop: 16
SyncInt::drop: 17
AsyncInt::async_drop: 18
AsyncInt::async_drop: 19
AsyncInt::async_drop: 20
AsyncUnion::async_drop: 21, 21
AsyncInt::async_drop: 10