rstest-log

It's used only as a dev dependency in 4 crates.

Depender (with downloads and own rev deps)			rstest-log version
240	5	sk-core	dev	^0.2.0
230	3	sk-store	dev	^0.2.0
200		skctl	dev	^0.2.0
190		sk-ctrl	dev	^0.2.0