alt Hacker NewsI agree with this whole-heartedly. Rust is a LANGUAGE and C is a LANGUAGE. They are used to describe behaviours. When you COMPILE and then RUN them you can measure speed, but that's dependent on two additional bits that are not intrinsically part of the languages themselves.
Now: the languages may expose patterns that a compiler can make use of to improve optimizations. That IS interesting, but it is not a question of speed. It is a question of expressability.
No. As you've made clear, it's a question of being able to express things in a way that gives more information to a compiler, allowing it to create executables that run faster.
Saying that a language is about "expressability" is obvious. A language is nothing other than a form of expression; no more, no less.