anchor.diff: -{ lib
  +{ stdenv
  +, lib
   , python
   , buildPythonPackage
   , fetchpatch
  
positive.code:       simplegeneric
      ];
  
      checkInputs = [
        pytest
      ];
  
      meta = {
  
negative.code:       tidyr
      ]) ++ extraRPackages ++ rWrapper.recommendedPackages;
  
      nativeBuildInputs = [
        R # needed at setup time to detect R_HOME (alternatively set R_HOME explicitly)
      ];
  
      propagatedBuildInputs = [
        ipython
  