>The whole point is that we don't have rustc.
This is a made up restriction.
I think one of the reasons that we sometimes think about different ways of compiler bootstrapping is that someone decided to spend their Turing Award lecture on the topic.
Ken Thompson, "Reflections on Trusting Trust". https://dl.acm.org/doi/10.1145/358198.358210
Okay, yes, if you declare the exercise pointless then you can skip it. That's not very interesting, though.
I think one of the reasons that we sometimes think about different ways of compiler bootstrapping is that someone decided to spend their Turing Award lecture on the topic.
Ken Thompson, "Reflections on Trusting Trust". https://dl.acm.org/doi/10.1145/358198.358210