rustup-toolchain is used at run time in 4 crates (of which 2 optionally). It's used only as a dev dependency in 9 crates.

Depender (with downloads and own rev deps) rustup-toolchain version
150 cargo-hax ^0.1
hax-subcommands ^0.1
neo4j optional ^0.1.6
skyfeed optional ^0.1.9
326K 269 syntect dev ^0.1.5
6.0K lilt dev ^0.1.9
1.7K af-iperps dev ^0.1.10
1.6K af-oracle dev ^0.1.10
1.4K cargo-public-api dev ^0.1.10
1.4K 1 syntect-no-panic dev ^0.1.5
850 4 rustic_core dev ^0.1.8
1 organize-rs_core dev ^0.1.4
syntect-5-no-panic dev ^0.1.5