add a AST validator (closes #12575)
diff --git a/Misc/NEWS b/Misc/NEWS
index d257632..b8b7915 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,8 @@
 Core and Builtins
 -----------------
 
+- Issue #12575: Validate user-generated AST before it is compiled.
+
 - Make type(None), type(Ellipsis), and type(NotImplemented) callable. They
   return the respective singleton instances.