Funny that you mention it, but Rust also checks all code in comments/documentation for validity, and runs test on your comments and catches if any of them fails to compile/return appropriate result.
No it doesn't. Rustdoc examines the "doc" attribute on every item for Markdowk code blocks and checks those. The "doc" attribute can be attached to an item directly, using Rust's general attribute syntax, or using so-called "doc comments" which are visually and lexically distinct from ordinary comments. In the case of single line comments (the preferred style), doc comments have three slashes instead of two; a good IDE or editor mode for Rust will highlight doc comments differently than ordinary ones.
Right, but it's nearly identical to having instructions in comments, like Go does. And while the post I was implying seems to think this isn't a valid use case, I think it is.
