Earlier quoted context omitted.
QuickBASIC works the same way. Rust doesn't really build its help documentation for "built-in" access in the programming environment (everything is web-based, even "local" docs launch in a web browser) but examples are a first-class feature; they're reused as test cases.
> Rust [...] everything is web-based Correction: Rust's help and documentation is HTML -based, and getting a local, automatically updated copy is trivial. > even "local" docs launch in a web browser Uh, so what? Can you name a better format for programming language documentation that's also ubiquitously supported?
Info format. It's supported by Emacs, and Emacs is the most ubiquitous of IDE's.