[Nix-dev] 6 month C4 adoption period

[stewart mackenzie]

Okay, then I'm absolutely boggled as to why each and every time I
update I have recompile rustBeta.rustc then rustUnstable.rustc.

I've literally been using nix-build ... -I
nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/125ffff089b6bd360c82cf986d8cc9b17fc2e8ac.tar.gz
for more than a month.
That is the last working revision of Rust.

I really should get sleep. I'm at my wits end.