TypeError with repo v2.29

[Zach Welch]

Hi all,

Our automation turned up the following error while running on a fairly stock Ubuntu 20.04 LTS host with Python 3.8.10.

info: A new version of repo is available
warning: repo is not tracking a remote branch, so it will not receive updates
info: Restarting repo with latest version
Traceback (most recent call last):
 File ".../.repo/repo/main.py", line 47, in <module>
   from subcmds.version import Version
 File ".../.repo/repo/subcmds/__init__.py", line 33, in <module>
   mod = __import__(__name__,
 File ".../.repo/repo/subcmds/selfupdate.py", line 19, in <module>
   from subcmds.sync import _PostRepoUpgrade
 File ".../.repo/repo/subcmds/sync.py", line 92, in <module>
   class _FetchResult(NamedTuple):
 File .../.repo/repo/subcmds/sync.py", line 100, in _FetchResult
   projects: set[str]
TypeError: 'type' object is not subscriptable

The following minimal patch works around the issue for me:

diff --git a/subcmds/sync.py b/subcmds/sync.py
index 5818b45..0780423 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -97,7 +97,7 @@ class _FetchResult(NamedTuple):
    projects (set[str]): The names of the git directories of fetched projects.
  """
  success: bool
-  projects: set[str]
+  projects: set
 
 
class _FetchMainResult(NamedTuple):
@@ -106,7 +106,7 @@ class _FetchMainResult(NamedTuple):
  Attributes:
    all_projects (list[Project]): The fetched projects.
  """
-  all_projects: list[Project]
+  all_projects: list
 
 
class _CheckoutOneResult(NamedTuple):