Issue #28003: Implement PEP 525 -- Asynchronous Generators.
diff --git a/Include/code.h b/Include/code.h
index b39d6bd..9823f10 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -59,6 +59,7 @@
    ``async def`` keywords) */
 #define CO_COROUTINE            0x0080
 #define CO_ITERABLE_COROUTINE   0x0100
+#define CO_ASYNC_GENERATOR      0x0200
 
 /* These are no longer used. */
 #if 0