Retrobootstrapping Rust for some reason

Article note: It's an interesting effort for any toolchain, but especially so for rust that is frequently self-incompatible. Also, reinforces something I notice ever more in computing: Debian is forever. Need to set up a box doing some job that you only lay hands on for a couple hours a year for decades? Debian. Need to spin a VM matching the state of a mainline OS 15 years ago? Debian. Need to bring up old hardware with a modern-ish environment? Debian.