depot/third_party/nixpkgs/maintainers/scripts/haskell/transitive-broken-packages.nix

let
  nixpkgs = import ../../..;
  inherit (nixpkgs { }) pkgs lib;
  getEvaluating =
    x:
    builtins.attrNames (
      lib.filterAttrs (
        _: v: (builtins.tryEval (v.outPath or null)).success && lib.isDerivation v && !v.meta.broken
      ) x
    );
  brokenDeps = lib.subtractLists (getEvaluating pkgs.haskellPackages) (
    getEvaluating (nixpkgs { config.allowBroken = true; }).haskellPackages
  );
in
''
  ${lib.concatMapStringsSep "\n" (x: " - ${x}") brokenDeps}
''