block_on_proc is used at run time in 5 crates (of which 2 optionally). It is a direct run-time dependency in 2 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) block_on_proc version
99K 38 rust-s3 optional ^0.2
mcs3 optional ^0.2