Bugs that sneak through code review are, almost by definition, the hardest to demonstrate. If a qualified person familiar with the code couldn't see it, it will

Bugs that sneak through code review are, almost by definition, the hardest to demonstrate. If a qualified person familiar with the code couldn't see it, it will take a lot to explain it to an average reader. Hidden bugs are generally in large and complex codebases, but such codebases are also the worst for example code in a blog post. So that's why the next best thing is to show it in obvious case, and leave it for you to extrapolate it to your complex cases. Also the more complex the problem, the more likely it is incomparable between C and Rust. The prime example is a controversy whether Heartbleed would have happened in Rust. On one hand a direct C-to-Rust translation of the whole system with a custom memory-reusing allocator wouldn't have prevented the bug. OTOH such approach from Rust perspective is very contrived and unusable in practice, so one can argue nobody would have structured the code like that in the first place.