rustup-toolchain is used at run time in 4 crates (of which 2 optionally). It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) rustup-toolchain version
120 cargo-hax ^0.1
650 skyfeed optional ^0.1.9
hax-subcommands ^0.1
neo4j optional ^0.1.6
269K 262 syntect dev ^0.1.5
1.5K cargo-public-api dev ^0.1.9
1.2K 1 syntect-no-panic dev ^0.1.5
470 4 rustic_core dev ^0.1.8
140 1 organize-rs_core dev ^0.1.4
syntect-5-no-panic dev ^0.1.5