Huh? Oh, I forgot yesterday when I send this hactoberfest already started (I do want to do hacktoberfest but I bet 4 pulls are easy). No, it wasn't because of hacktoberfest, I was just browsing nix docs and I noticed this weird thing in nix-env https://nixos.org/manual/nix/unstable/command-ref/nix-env.html, looks like it is also there for nix-build but I don't see this in all pages.
Okay, I didn't know this is part of frontmatter since they usually have
By the way, happy mid-autumn festival (yesterday)! :D