anchor.diff:  
     targets = let
       srcFilter = path: type:
  -      (baseNameOf path == "package.yaml")
  -      || pkgs.lib.hasInfix "/src" path
  -      || pkgs.lib.hasInfix "/vk" path
  -      || pkgs.lib.hasInfix "/vma" path;
  +      (baseNameOf path == "package.yaml") || pkgs.lib.hasInfix "/src" path
  +      || pkgs.lib.hasInfix "/vk" path || pkgs.lib.hasInfix "/vma" path;
       filter = builtins.filterSource srcFilter;
     in {
       vulkan = filter ./.;
  
positive.code:             pkg = "language-c";
              ver = "0.9";
              sha256 = "1dxi56aawabq2ds6crvhhr9dwmbyanjkn9l0yhw7wcqrwx71kliq";
            } {};
          } // pkgs.lib.optionalAttrs hoogle {
            ghc = super.ghc // { withPackages = super.ghc.withHoogle; };
            ghcWithPackages = p:
  
negative.code:   haskellPackages = with pkgs.haskell.lib;
      pkgs.haskell.packages.${compiler'}.override {
        overrides = self: super:
          (pkgs.lib.mapAttrs makeDrv targets) // {
            #
            # Examples
            #
  