So, like https://doc.rust-lang.org/std/marker/index.html?
Those are integrated in the compiler and don't need a second tool to work.
Also, AFAIK, they only leverage standard language behaviour and are not a hardcoded special case.
Those are integrated in the compiler and don't need a second tool to work.
Also, AFAIK, they only leverage standard language behaviour and are not a hardcoded special case.