@@ -28,8 +28,6 @@ jobs:
     - name: Install dependencies and prepare tests
       run: |
         set -x
-        sudo rm -rf "/usr/local/share/boost"
-        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
 
         python -m pip install --upgrade pip setuptools wheel
         python --version; git --version
 
@@ -9,7 +9,7 @@
 
 # typing ------------------------------------------------------------------
 
-from typing import Any, NoReturn, Union, TYPE_CHECKING
+from typing import Any, Iterator, NoReturn, Union, TYPE_CHECKING
 from git.types import PathLike
 
 
@@ -28,7 +28,7 @@ class RemoteReference(Head):
     @classmethod
     def iter_items(cls, repo: 'Repo', common_path: Union[PathLike, None] = None,
                    remote: Union['Remote', None] = None, *args: Any, **kwargs: Any
-                   ) -> 'RemoteReference':
+                   ) -> Iterator['RemoteReference']:
         """Iterate remote references, and if given, constrain them to the given remote"""
         common_path = common_path or cls._common_path_default
         if remote is not None: