It's used only as a dev dependency in 11 crates.

Depender (with downloads and own rev deps) quickcheck_derive version
8.0K 14 diff-struct dev ^0.3
160 2 hotfix-codegen dev ^0.3
120 fefix dev ^0.3
120 1 hotfix-message dev ^0.3
hotfix-encoding dev ^0.3
fasters dev ^0.3
actyx_sdk dev ^0.3.0
fefast dev ^0.3
1 byztime dev ^0.3
3 hotfix-dictionary dev ^0.3
byztimed dev ^0.3