use %R format code; fixes invalid dereferencing #10391
diff --git a/Misc/NEWS b/Misc/NEWS
index 8ab404d..138f0f5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #10391: Don't dereference invalid memory in error messages in the ast
+  module.
+
 - Issue #9518: Extend the PyModuleDef_HEAD_INIT macro to explicitly
   zero-initialize all fields, fixing compiler warnings seen when building
   extension modules with gcc with "-Wmissing-field-initializers" (implied