PyErr_NormalizeException may not set an error, so convert the PyErr_SetObject
call on hitting the recursion limit into just assigning it to the arguments provided.
diff --git a/Misc/NEWS b/Misc/NEWS
index 196f5a9..a331bd7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and Builtins
-----------------
+- Fix a problem in PyErr_NormalizeException that leads to "undetected errors"
+ when hitting the recursion limit under certain circumstances.
+
- Issue #1665206: Remove the last eager import in _warnings.c and make it lazy.
- Issue #4865: On MacOSX /Library/Python/2.7/site-packages is added to