PEP 0492 -- Coroutines with async and await syntax. Issue #24017.
diff --git a/Lib/test/badsyntax_async2.py b/Lib/test/badsyntax_async2.py
new file mode 100644
index 0000000..1e62a3e
--- /dev/null
+++ b/Lib/test/badsyntax_async2.py
@@ -0,0 +1,3 @@
+async def foo():
+    def foo(a:await something()):
+        pass