Rust's style guide tells me what to write but not how much of it is enforced by tooling. If the formatter and clippy already settle naming and line width, then the guide is largely a document for the cases the tools can't see, which changes who it's for and how it gets maintained. Where does the split sit, and what happens when the guide and the tooling disagree?

The rules of no directories and super-small crates seem kinda silly to me but I guess Google's build system is special enough that it makes sense for them.