ftree

ftree is used at run time in 8 crates (of which 1 optionally). It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps)			ftree version
1.8K	2	indexset		^1.1.0
100	3	wdl-lint		^1.2.0
		ernst		^1.0.1