Using experimental Nix features in Nixos, and when they will land in stable

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You need to set nix.package in configuration.nix:

nix = {
   package = pkgs.nixFlakes;
   extraOptions = lib.optionalString (config.nix.package == pkgs.nixFlakes)
     "experimental-features = nix-command flakes";
};

The fragment above should be adjusted to check for the nix version instead as of 2022-07.

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