Why don't more libraries have documentation that links directly to the source? Sometimes it's good to peek behind the curtain.
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It's rare to see ANSI escape codes for URLs in the wild, but cargo has it!
This example links to https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles, describing the different profiles.
Considering releases vs debug is a source of confusion for new users expecting better performance, this seems wise.
On the challenge of writing accurate source spans on Unicode source code: https://reedmullanix.com/posts/unicode-source-spans.html
Also (see footnotes) a fair number of LSP clients assume UTF-8 despite early versions of LSP mandating UTF-16!
Coming from JS or Python, imports in Rust feel weird. They're entirely optional aliases for fully qualified symbols, which are always available.
I don't know of many other languages where you can just start using libraries. Java is the only one I can think of.