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error:
       … while calling the 'fetchTree' builtin
         at /pwd/in.nix:3:1:
            2| # https://git.lix.systems/lix-project/lix/issues/1133
            3| builtins.fetchTree {
             | ^
            4|   type = "github";

       error: input 'github:nixos/nixpkgs' has both ref (nixpkgs-unstable) and rev (e4bae1bd10c9c57b2cf517953ab70060a828ee6f), which is not allowed