Retainer is used at run time in 5 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) Retainer version
3.4K rencfs ^0.3.0
force-rss ^0.3
kapiti ^0.3
werkbank ^0.3.0
fast42 ^0.3
117K 3 ssh-agent-lib dev ^0.3.0