anchor.diff:  
   python3Packages.buildPythonApplication rec {
     name = "xonsh-${version}";
  -  version = "0.3.4";
  +  version = "0.4.1";
   
     src = fetchFromGitHub {
       owner = "scopatz";
       repo = "xonsh";
       rev = version;
  -    sha256= "13inkj0vs8nqdghp3j19dardawfsdmcsfzsp77hlwavmw7sqjxzi";
  +    sha256= "1d5w307vgpqjimhfipkwsnh3lvvajva9fjl58sg9hh322qicm01g";
     };
   
     ## The logo xonsh prints during build contains unicode characters, and this
  
positive.code:     HOME=$TMPDIR nosetests -x
    '';
  
    buildInputs = with python3Packages; [ glibcLocales nose ];
    propagatedBuildInputs = with python3Packages; [ ply prompt_toolkit ];
  
    meta = with stdenv.lib; {
      description = "A Python-ish, BASHwards-compatible shell";
      homepage = "http://xonsh.org";
      license = licenses.bsd3;
      maintainers = with maintainers; [ spwhitt garbas ];
      platforms = platforms.all;
    };
  
  
negative.code:   patchPhase = ''
      rm xonsh/winutils.py
      sed -i -e "s|/bin/ls|${coreutils}/bin/ls|" tests/test_execer.py
      sed -ie 's|test_win_ipconfig|_test_win_ipconfig|g' tests/test_execer.py
      sed -ie 's|test_ipconfig|_test_ipconfig|g' tests/test_execer.py
      rm tests/test_main.py
      rm tests/test_man.py
    '';
  