Prefix AST symbols with _Py_. Fixes #1637022.
diff --git a/Misc/NEWS b/Misc/NEWS
index f277450..e16ba88 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and builtins
 -----------------
 
+- Bug #1637022: Prefix AST symbols with _Py_.
+
 - Prevent seg fault on shutdown which could occur if an object
   raised a warning.