It's used at build time in 14 crates (of which 3 optionally, 10 directly).

Depender (with downloads and own rev deps) build-target version
48K flutter_rust_bridge build ^0.4.0
110 1 mira build ^0.4.0
110 1 nethost-sys build ^0.4
transparent build ^0.4
1 wolfssl-sys build ^0.4.0
pytorch-cpuinfo build ^0.4.0
1 wildland-http-client build ^0.4
cask-cli build ^0.4.0
pytorch-cpuinfo-pieces build ^0.4.0
nstd-sys optional build ^0.4