mpsc is used at run time in 7 crates (of which 1 optionally).

Depender (with downloads and own rev deps) mpsc version
280 1 handy-grpc ^0.2
180 1 task-exec-queue ^0.2
rsacracker ^0.2
emulatorr ^0.2.0
simln-lib ^0.2.0
1 stdr ^0.2.0
170 rust-box optional ^0.2.4