r2rs-mass is used at run time in 6 crates. It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 3 crates.

Depender (with downloads and own rev deps) r2rs-mass version
340 r2rs ~0.1
310 2 strafe-tests ~0.1
310 3 strafe-datasets ~0.1
310 1 strafe-numerics ~0.1