I am not interested in C++, it is also far too complex. In my opinion software needs to become simpler and not more complicated, and I fear Rust might be a step into the wrong direction.

Which is also the reason why we don't have #pragma once and many other extensions like it. Except we do. Compilers can add rust-like static analyzers without the standard committee mandating it.

In principle, the full lifetime system of Rust can be added to C++ without committee approval, but in reality the chances seem low.