1:main┐concurrent::hierarchical-example version=0.1
1:main└───┐concurrent::server host="localhost", port=8080
1:main    ├─── INFO concurrent starting
1:main    ├─── INFO concurrent listening
1:main    ├─── DEBUG concurrent starting countdowns
1:main    └───┐concurrent::countdowns 
1:main        └───┐concurrent::countdown_a 
1:main            ├─── DEBUG concurrent polling countdown, label="a", count=3
1:main        └───┐concurrent::countdown_b 
1:main            ├─── DEBUG concurrent polling countdown, label="b", count=5
1:main            ├─── DEBUG concurrent polling countdown, label="b", count=4
1:main        └───┐concurrent::countdown_a 
1:main            ├─── DEBUG concurrent polling countdown, label="a", count=2
1:main    └───┐concurrent::conn peer_addr="82.9.9.9", port=42381
1:main        ├─── WARN concurrent peer1 warning
1:main    └───┐concurrent::countdowns 
1:main        ├─── INFO concurrent finished polling countdowns
1:main        ┌───┘
1:main        ┌───┘
1:main    ┌───┘
1:main    ┌───┘
1:main    ├─── INFO concurrent all done!
1:main    ├─── INFO concurrent exit
1:main┌───┘
1:main┘