prevert ast errors from being normalized before ast_error_finish is called (closes #15846)
diff --git a/Misc/NEWS b/Misc/NEWS
index 4bb9698..544bf67 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #15846: Fix SystemError which happened when using ast.parse in an
+  exception handler on code with syntax errors.
+
 - Issue #15761: Fix crash when PYTHONEXECUTABLE is set on Mac OS X.
 
 - Issue #15801: Make sure mappings passed to '%' formatting are actually