Add PyErr_WarnEx() so C code can pass the stacklevel to warnings.warn().
This provides the proper warning for struct.pack().
PyErr_Warn() is now deprecated in favor of PyErr_WarnEx().
As mentioned by Tim Peters on python-dev.
diff --git a/Misc/NEWS b/Misc/NEWS
index 141850d..dac1129 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,10 @@
Core and builtins
-----------------
+- Add PyErr_WarnEx() so C code can pass the stacklevel to warnings.warn().
+ This provides the proper warning for struct.pack().
+ PyErr_Warn() is now deprecated in favor of PyErr_WarnEx().
+
- Patch #1531113: Fix augmented assignment with yield expressions.
Also fix a SystemError when trying to assign to yield expressions.