anchor.diff:  , requests-toolbelt
   , shellingham
   , tomlkit
  +, virtualenv
   }:
   
   buildPythonPackage rec {
     pname = "poetry";
  -  version = "1.0.10";
  +  version = "1.1.0";
     format = "pyproject";
     disabled = isPy27;
   
  
positive.code:     owner = "python-poetry";
      repo = pname;
      rev = version;
      sha256 = "00qfzjjs6clh93gfl1px3ma9km8qxl3f4z819nmyl58zc8ni3zyv";
    };
  
    postPatch = ''
      substituteInPlace pyproject.toml \
       --replace "pyrsistent = \"^0.14.2\"" "pyrsistent = \"^0.16.0\"" \
       --replace "requests-toolbelt = \"^0.8.0\"" "requests-toolbelt = \"^0.9.1\"" \
       --replace 'importlib-metadata = {version = "~1.1.3", python = "<3.8"}' \
         'importlib-metadata = {version = ">=1.3,<2", python = "<3.8"}' \
       --replace "tomlkit = \"^0.5.11\"" "tomlkit = \"<2\"" \
       --replace "cleo = \"^0.7.6\"" "cleo = \"^0.8.0\"" \
       --replace "version = \"^20.0.1\", python = \"^3.5\"" "version = \"^21.0.0\", python = \"^3.5\"" \
       --replace "clikit = \"^0.4.2\"" "clikit = \"^0.6.2\""
    '';
  
    nativeBuildInputs = [ intreehooks ];
  
negative.code:     "load"
      "vcs"
      "prereleases_if_they_are_compatible"
      "test_executor"
      # requires git history to work correctly
      "default_with_excluded_data"
      # toml ordering has changed
      "lock"
      # fs permission errors
      "test_builder_should_execute_build_scripts"
    ];
  
    meta = with lib; {
  