rustup-toolchain is used at run time in 2 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
hax-subcommands ^0.1
130 neo4j optional ^0.1.6
165K 202 syntect dev ^0.1.5
1.6K cargo-public-api dev ^0.1.6
200 2 rustic_core dev ^0.1.6
140 1 organize-rs_core dev ^0.1.4