let-bizzare-bad.nix

{
  users.extraUsers =
    let mkUser = desc: { isNormalUser = true; description = desc; };
    in
    {
      foo = mkUser "foo";
    };
  users.extraUsers.root.openssh.authorizedKeys.keys = [ "bar" ];
}


/*

/tmp ❯❯❯ nix-instantiate --eval let-bizzare-bad.nix
error: attribute ‘users.extraUsers.root.openssh.authorizedKeys.keys’ at /private/tmp/let-bizzare-bad.nix:8:3 already defined at /private/tmp/let-bizzare-bad.nix:2:3

*/

let-bizzare-good.nix

let mkUser = desc: { isNormalUser = true; description = desc; };
in
{
  users.extraUsers = {
    foo = mkUser "foo";
  };
  users.extraUsers.root.openssh.authorizedKeys.keys = [ "bar" ];
}


/*

/tmp ❯❯❯ nix-instantiate --eval let-bizzare-good.nix                                                                                                                                                                                     ✘ 1 
{ users = <CODE>; }

*/