Undefined variable xor

[eyJhb]

pr NixOS/nixpkgs#301556 introduced lib.xor, now nixus gives the following error when trying to build.

error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'deploy'
         whose name attribute is located at /nix/store/qhpbfimgrjbfywkpm9i50c28dpyy39iv-nixpkgs-stable-src/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'text' of derivation 'deploy'

         at /nix/store/qhpbfimgrjbfywkpm9i50c28dpyy39iv-nixpkgs-stable-src/pkgs/build-support/trivial-builders/default.nix:148:16:

          147|     runCommand name
          148|       { inherit text executable checkPhase allowSubstitutes preferLocalBuild;
             |                ^
          149|         passAsFile = [ "text" ];

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: undefined variable 'xor'

       at /nix/store/q53q6j2dixwy77xvxcj41n80z04hw1xd-nixpkgs-src/nixos/modules/config/users-groups.nix:875:16:

          874|               isEffectivelySystemUser = user.isSystemUser || (user.uid != null && user.uid < 1000);
          875|             in xor isEffectivelySystemUser user.isNormalUser;
             |                ^
          876|             message = ''
┏━ 1 Errors:
┃ error:
┃        … while calling the 'derivationStrict' builtin
┃
┃          at /builtin/derivation.nix:9:12: (source not available)
┃
┃        … while evaluating derivation 'deploy'
┃          whose name attribute is located at /nix/store/qhpbfimgrjbfywkpm9i50c28dpyy39iv-nixpkgs-stable-src/pkgs/stdenv/gener…
┃
┃        … while evaluating attribute 'text' of derivation 'deploy'
┃
┃          at /nix/store/qhpbfimgrjbfywkpm9i50c28dpyy39iv-nixpkgs-stable-src/pkgs/build-support/trivial-builders/default.nix:1…
┃
┃           147|     runCommand name
┃           148|       { inherit text executable checkPhase allowSubstitutes preferLocalBuild;
┃              |                ^
┃           149|         passAsFile = [ "text" ];
┃
┃        (stack trace truncated; use '--show-trace' to show the full trace)
┃
┃        error: undefined variable 'xor'
┃
┃        at /nix/store/q53q6j2dixwy77xvxcj41n80z04hw1xd-nixpkgs-src/nixos/modules/config/users-groups.nix:875:16:
┃
┃           874|               isEffectivelySystemUser = user.isSystemUser || (user.uid != null && user.uid < 1000);
┃           875|             in xor isEffectivelySystemUser user.isNormalUser;
┃              |                ^
┃           876|             message = ''
┣━━━
┗━ ∑ ⚠ Exited with 1 errors reported by nix at 15:54:12 after 2s`

I've tried to bump nixus nixpkgs using

eyjhb@chronos /t/nixus (master)> nix-shell -p niv --run 'niv update'
Updating all packages
  INFO: new sources.nix available: 27 -> 28
    Please run 'niv init' or add the following line in the nix/sources.nix file:
    # niv: no_update
  Package: nixpkgs
Done: Updating all packages
eyjhb@chronos /t/nixus (master)> git diff
diff --git a/nix/sources.json b/nix/sources.json
index 2508113..38f2ba0 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "21eb6c6ba74dcbe3ea5926ee46287300fb066630",
-        "sha256": "1p0v1n5px47xlaj3qhqys0l0ia8a8bvgali6lhyjxs2bgspx5fb4",
+        "rev": "1e1dc66fe68972a76679644a5577828b6a7e8be4",
+        "sha256": "1nmra8aiiazi0w19x4cbb3qzy3l6ff9yaki3pkibhwh2grm88132",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/21eb6c6ba74dcbe3ea5926ee46287300fb066630.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/1e1dc66fe68972a76679644a5577828b6a7e8be4.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }

However it still produces the same error.