> Macros are of course enormously useful but also very difficult to shoe horn into a c-family language properly since they need to be expanded at compile time (unless you just go ahead and embed you compiler backend into the runtime system of your language. That would be kinda of crazy/awesome but you could do it). Rust has of course proven the utility of such a choice.

Rust doesn't do that. Rust expands the macros at compile-time. Integrating the whole compiler into the runtime wouldn't make much sense considering what area Rust is targeting.

It's also recommended to not link a crate that is used during runtime with the compiler or parser because they're fairly big and would bloat your final build by a large amount.