Only after much irritation, I understood that using #![cfg(target_os = "windows")] is responsible for my crates https://docs.rs/win-beep/latest/win_beep/ and https://docs.rs/vcvars/latest/vcvars/ showing empty documentation. How must it be for a potential user of the crates?

I read that using #![cfg(target_os = "windows")] is better than causing compiler errors in a crate dependency (the crate being the dependency of others).

I now know that I can show the documentation by choosing an entry from the "Platform" drop-down menu (the entries are quite cryptic though, easily scaring you off). But I think docs.rs should, e.g., automatically choose a non empty "Platform" entry to be displayed.

Maybe it would be best to choose a platform that corresponds to what can be retrieved from the running browser (favoring 64 bits, of course, if this info can't be retrieved). And if that would result in an empty crate, show a message, if true, that there are other non-empty crate variants behind the "Platform" drop-down menu.