`thread caused non-unwinding panic. aborting.`

[MichaReiser]

The unwrap call here can fail when the lock got poisoned because of a panic, causing a panic while unwinding

tracing-tree/src/lib.rs

Line 574 in 12ac87f

let bufs = &mut *self.bufs.lock().unwrap();

The application doesn't abort when using a different tracing subscriber.

I think a fix here could be to not print to buf but otherwise run the logic "as normal"