It can invoke procedural macros, but those macros need to be built by something, and rustc won't do that by itself: https://blog.jetbrains.com/rust/2022/07/07/p

It can invoke procedural macros, but those macros need to be built by something, and rustc won't do that by itself: https://blog.jetbrains.com/rust/2022/07/07/procedural-macros-under-the-hood-part-ii/ https://blog.jetbrains.com/rust/2022/07/07/procedural-macros... I still think it's very not good that proc macros have full access to your system, but `rustc` alone cannot build a hostile macro as part of building some code that depends upon it.