rustc-ap-rustc_lint_defs is used at run time in 7 crates. It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps) rustc-ap-rustc_lint_defs version
550 8 rustc-ap-rustc_errors ^727.0.0
320 6 rustc-ap-rustc_session ^727.0.0
280 1 rustc-ap-rustc_expand ^727.0.0