[Python-checkins] Add comments to `{typing, _collections_abc}._type_repr` about each other (#102752)

[AlexWaygood]

https://github.com/python/cpython/commit/a297d59609038ccfc3bdf6f350e8401f07b0a931
commit: a297d59609038ccfc3bdf6f350e8401f07b0a931
branch: main
author: Nikita Sobolev <mail at sobolevn.me>
committer: AlexWaygood <Alex.Waygood at Gmail.com>
date: 2023-03-16T13:05:38Z
summary:

Add comments to `{typing,_collections_abc}._type_repr` about each other (#102752)

Remove `if` condition in `_collections_abc._type_repr` that's no longer needed, bringing it in sync with `typing._type_repr`.

files:
M Lib/_collections_abc.py
M Lib/typing.py

diff --git a/Lib/_collections_abc.py b/Lib/_collections_abc.py
index c62233b81a5c..f86b91a5e6fb 100644
--- a/Lib/_collections_abc.py
+++ b/Lib/_collections_abc.py
@@ -517,9 +517,8 @@ def _type_repr(obj):
 
     Copied from :mod:`typing` since collections.abc
     shouldn't depend on that module.
+    (Keep this roughly in sync with the typing version.)
     """
-    if isinstance(obj, GenericAlias):
-        return repr(obj)
     if isinstance(obj, type):
         if obj.__module__ == 'builtins':
             return obj.__qualname__
diff --git a/Lib/typing.py b/Lib/typing.py
index ab3343956761..3ee9679e50c0 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -230,6 +230,9 @@ def _type_repr(obj):
     typically enough to uniquely identify a type.  For everything
     else, we fall back on repr(obj).
     """
+    # When changing this function, don't forget about
+    # `_collections_abc._type_repr`, which does the same thing
+    # and must be consistent with this one.
     if isinstance(obj, type):
         if obj.__module__ == 'builtins':
             return obj.__qualname__