https://github.com/rust-lang-nursery/rustup.rs https://github.com/rust-lang-nursery/rustup.rs is the repo. The setup tool and the tool itself are the same bina

https://github.com/rust-lang-nursery/rustup.rs https://github.com/rust-lang-nursery/rustup.rs is the repo. The setup tool and the tool itself are the same binary. The rustup install is basically copying rustup-init.exe to `~/.cargo/bin/rustup.exe`.