rustdoc has a separate environment variable for banning warnings, so
set that in the GitHub action configuration.
https://github.com/rust-lang/cargo/issues/8424#issuecomment-1070988443
Fix all the rustdoc warnings on unknown types or functions. I've
updated references wherever it's obvious, otherwise I've replaced the
rustdoc link with plain backticks.
There were also some cases where rustdoc links referred to private
APIs. I've disabled the rustdoc private API warning in those crates.
The v2 implementation uses Node 12, which is end-of-life on April 30, 2022.
See https://nodejs.org/en/about/releases/. Update to v3, which is based on
Node 16 whose support lasts until April 30, 2024.
It's very useful when `pub` is equivalent to "this is crate's public
API", let's enforce this!
Ideally, we should enforce it for local `cargo test`, and only during
CI, but that needs https://github.com/rust-lang/cargo/issues/5034.
