It's used at build time in 17 crates (of which 1 optionally, 10 directly).

Depender (with downloads and own rev deps) readme_rustdocifier version
1.1K 6 audiotags build ^0.1.1
550 3 unix-ts build ^0.1
550 1 unix-ts-macros build ^0.1
240 reed-solomon-simd build ^0.1.0
100 sensible build ^0.1
1 reed-solomon-16 build ^0.1.0
x64 build ^0.1.0
audiotags2 build ^0.1.0
ml-downloader build ^0.1.1
ml-progress build ^0.1.1