Restore functools

Author: vstinner

Lib/functools.py

@@ -687,6 +687,7 @@ def wrapper(*args, **kwds):
                     # still adjusting the links.
                     root = oldroot[NEXT]
                     oldkey = root[KEY]
+                    oldresult = root[RESULT]  # noqa: F841
                     root[KEY] = root[RESULT] = None
 
                     # Now update the cache dictionary.