tectonic_pdf_io is used at run time in 19 crates (of which 5 optionally). It is a direct run-time dependency in 2 crates.

Depender (with downloads and own rev deps) tectonic_pdf_io version
800 1 tectonic_engine_xetex >=0.3.0, <1
750 1 tectonic_engine_xdvipdfmx >=0.4.0, <1