rustup-toolchain is used at run time in 3 crates (of which 1 optionally). It's used only as a dev dependency in 4 crates.

Depender (with downloads and own rev deps) rustup-toolchain version
cargo-hax ^0.1
hax-subcommands ^0.1
170 neo4j optional ^0.1.6
186K 241 syntect dev ^0.1.5
2.6K 4 rustic_core dev ^0.1.7
1.2K cargo-public-api dev ^0.1.8
140 1 organize-rs_core dev ^0.1.4