It is very interesting, though I do have a small gripe with how they characterise the "goto fail" bug. #[must_use] probably wouldn't have helped because the bug

It is very interesting, though I do have a small gripe with how they characterise the "goto fail" bug. #[must_use] probably wouldn't have helped because the bug was that they effectively returned Ok() early. However, having an ergonomic error handling design in a systems language definitely helps. try! and ? are actually a massive improvement in the state of systems languages. Error handling is very important when designing a language.