anchor.diff:    l_set_web = setPrio "7" (buildEnv {
       name = "l-set-web";
       ignoreCollisions = true;
  -    paths = [
  -      firefox
  -      chromium
  -      qutebrowser
  -      offlineimap
  -      notmuch
  -      rtorrent
  -    ];
  +    paths = [ firefox chromium qutebrowser offlineimap notmuch rtorrent ];
     });
   
     l_set_av = setPrio "8" (buildEnv {
  
positive.code:     url = "/home/l/prog/foreign/nixpkgs";
      ref = "refs/heads/nixpkgs-unstable";
      # Known good commit for moving branch "nixpkgs-unstable".
      rev = "2c0f6135aab77ff942b615228882c7dd996e0882";
    }) {};
  in
  {super}:
  # The `with` keyword in `with X; Y` adds the attributes of X to the scope
  # while evaluating Y. This way, we can just write `buildEnv` instead of
  # `pkgs.buildEnv`.
  
negative.code:       tig
        clang
        elixir
        elixir_ls
        gcc
        go
        gocode
        golint
        gomodifytags
        gore
        gotests
        gotools
        html-tidy
        inotify-tools
        ispell
        nodePackages.js-beautify
        nodePackages.stylelint
        nixfmt
        pipenv
        binutils
        gnumake
        python39
  