`with` and `rec` are considered anti-patterns:

- `with` makes it unclear where variables are assigned and what
  variables refer to.

  Instead of `with pkgs; [ foo ]`, write `[ pkgs.foo ]` directly.

- `rec` also makes it unclear what variables refer to and makes it easy
  to introduce subtle bugs.

  Instead of `rec { a = 1; b = a; }`, use a let binding:

    let a = 1;
        b = a;
     in {
        inherit a b;
     }