C and C++ could both easily add this feature:

https://www.digitalmars.com/articles/C-biggest-mistake.html

which is adding slices to the native language. This will eliminate buffer overflow errors (if the user uses that feature). D has had this from the beginning, and while it doesn't cover everything, that feature alone has resulted in an enormous reduction in memory safety errors.

BTW, D also has a prototype ownership/borrowing system.