It's used at build time in 6 crates (of which 1 optionally, 5 directly).

Depender (with downloads and own rev deps) ReportMe version
950 2 variable-len-reader build >=0.2
600 2 tcp-handler build >=0.2
460 1 upgrade build >=0.2
400 1 tcp-client build >=0.2
120 tcp-server build ~0.2