I was kind of thinking that yesterday when looking at a Rust library. Rust is competent with line numbers, so you don't really have an incentive for splitting files from that angle, but sometimes, folks just seem to keep adding to their files ad infinitum.

Well, specifically that library has a few files with more than 1k lines. And I hope this one's the largest at 4k lines: https://docs.rs/git2/latest/src/git2/repo.rs.html

What also needs to be said, is that this library is actually maintained by the Rust language team. Really makes me want to open an issue to tell them that Rust has a pretty cool module system. 🙃