tracing-tree 0.4.1

A Tracing Layer which prints a tree of spans and events.
Documentation 
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1:main┐concurrent_eager::spawn_fut key="a"
1:main┐concurrent_eager::spawn_fut key="b"
1:main┐concurrent_eager::spawn_fut key="a"
1:main└───┐concurrent_eager::a 
1:main┐concurrent_eager::spawn_fut key="b"
1:main└───┐concurrent_eager::b 
1:main┐concurrent_eager::spawn_fut key="a"
1:main└───┐concurrent_eager::a 
1:main    ├─── INFO concurrent_eager a
1:main┌───┘
1:main┐concurrent_eager::spawn_fut key="b"
1:main└───┐concurrent_eager::b 
1:main    ├─── INFO concurrent_eager b
1:main┌───┘
1:main┘
1:main┘