anchor.diff:      "dask.diagnostics"
     ];
   
  -  passthru.optional-dependencies = {
  -    complete = [ distributed ];
  -  };
  -
     meta = with lib; {
       description = "Minimal task scheduling abstraction";
       homepage = "https://dask.org/";
  
positive.code:   passthru.optional-dependencies = {
      array = [
        numpy
      ];
      dataframe = [
        numpy
  
negative.code:     owner = "dask";
      repo = pname;
      rev = version;
      hash = "sha256-8M70Pf31PhYnBPRhSG55eWg6gK0lxsIFKF+cRCsf0/U=";
    };
  
    propagatedBuildInputs = [
  