Home-manager: Fail to use master branch for flake.

[LEXUGE]

Issue description

Since bqv-flake is deprecated, I am trying to migrate to master branch. However, as I used it like that in README, it gave me errors like:

at: (211:11) in file: /nix/store/g1k7afvd578l1gqyljia2ycj1irxc91x-source/modules/modules.nix

   210|         else
   211|           <nixpkgs>);
      |           ^
   212|       _module.args.pkgs = lib.mkDefault pkgs;

cannot look up '<nixpkgs>' in pure evaluation mode (use '--impure' to override)

The code https://github.com/nix-community/home-manager/blob/84bcce3c252b9e6736a455b02a991b6a220dda8a/modules/modules.nix#L211 should not reference to <nixpkgs>. I am not sure what's going on here.

Technical details

• system: "x86_64-linux"
• host os: Linux 5.8.6, NixOS, 21.03.20200915.441a7da (Okapi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 3.0pre20200829_f156513
• channels(root): "nixos-21.03pre243690.441a7da8080, nixpkgs-21.03pre243690.441a7da8080"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

[rycee]

Do you have home.stateVersion = "20.09"; in your configuration? If not, then try adding it and see if the issue goes away.

[LEXUGE]

Yes, that's exactly where the problem originated. Thanks.