anchor.diff:  
   
     alot = buildPythonPackage rec {
  -    rev = "fa10bfc2de105da819c8e11e913a44c3c1ac60a4";
  +    rev = "fa4ddf000dc2ac4933852b210901b649634a5f86";
       name = "alot-0.3.5_${rev}";
   
       src = fetchurl {
         url = "https://github.com/pazz/alot/tarball/${rev}";
         name = "${name}.tar.bz";
  -      sha256 = "0zd4jiwxqb7m672xkr5jcqkfpk9jx1kmkllyvjjvswkgjjqdrhax";
  +      sha256 = "0h11lqyxg0xbkc9y1xqjvd0kmfm5pdwnmv9chmlsi1614dxn08n0";
       };
   
       # error: invalid command 'test'
  
positive.code:   };
  
    subprocess32 = buildPythonPackage rec {
      name = "subprocess32-3.2.5rc1";
  
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/s/subprocess32/${name}.tar.gz";
        md5 = "f5f46106368be6336b54af95d048fea9";
      };
  
      doCheck = false;
  
negative.code: 
  
    urwid = buildPythonPackage (rec {
      name = "urwid-1.2.1";
  
      # multiple:  NameError: name 'evl' is not defined
      doCheck = false;
  
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/u/urwid/${name}.tar.gz";
        md5 = "6a05ada11b87e7b026b01fc5150855b0";
      };
  
      meta = {
  