r2rs-base is used at run time in 9 crates. It is a direct run-time dependency in 5 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) r2rs-base version
r2rs ~0.1
7 r2rs-stats ~0.1
4 r2rs-mass ~0.1
5 r2rs-rfit ~0.1
1 strafe-numerics ~0.1
10 r2rs-nmath dev ~0.1