Mach is what you interact with when doing stuff in Servo, but all the build-* sub-commands end up calling Cargo, which is what does the heavy lifting. The typi

Mach is what you interact with when doing stuff in Servo, but all the build-* sub-commands end up calling Cargo, which is what does the heavy lifting. The typical `./mach build` command will download known-good versions of Rust Nightly and Cargo (unless that’s already done), call `cargo build` with some flags, then show a system notification when it’s done. That’s it.