Something that would automatically generate the signatures and modules entry points/data types. These seem to be very neglected and generally hard to keep up-to-date in the Rust ecosystem.
Perhaps I am reading your comment wrong, but:
- Generated Rust crate docs include signatures for all of their public functions, and
- Generated Rust crate docs include public enums, public fields of public structs, etc
e.g. here the signatures haven't been written manually... https://doc.rust-lang.org/std/string/struct.String.html
If you click 'src' at the top-right you'll see the full extent of the doc comments that generated it. (You get signatures without any comments.)