The implicit problem here (pun intended) in the given examples are implicitness vs. explicitness. Rust chose (intentionally or otherwise) to do the opposite of

The implicit problem here (pun intended) in the given examples are implicitness vs. explicitness. Rust chose (intentionally or otherwise) to do the opposite of the many things that C++ does, because C++ does it wrong. And C++ does it wrong because we didn't know any better at the time, and the world, pre-internet, was much less connected. Someone had to do it first (or first-ish). The main thing I like about Rust is the tooling. C++ is death by a thousand build systems and sanitizers.