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If they'd used a sane document language like LaTeX instead of markdown, it would have been trivial to actually run the examples on build.

Markdown has it's place... books is not it.

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The book is written in mdbook which has built-in support for testing Rust examples [0], as well as running examples on the playground [1].

[0]: https://rust-lang.github.io/mdBook/cli/test.html

[1]: https://rust-lang.github.io/mdBook/format/mdbook.html#rust-p...

I agree LaTeX has it's uses, but... markdown can also do this trivially. See for example the Rust Book [1], and `cargo test` automatically runs example code in markdown doccomments.

[1] https://doc.rust-lang.org/stable/book/ch01-02-hello-world.ht...

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