pythonGH-117536: fix athrow().throw(...) unawaited warning

Author: graingert

Lib/test/test_asyncgen.py

@@ -1752,6 +1752,17 @@ async def gen():
             g.aclose()
             gc_collect()
 
+    def test_aclose_throw(self):
+        async def gen():
+            return
+            yield
+
+        class MyException(Exception):
+            pass
+
+        g = gen()
+        with self.assertRaises(MyException):
+            gen.aclose().throw(MyException)
 
 
 if __name__ == "__main__":

Objects/genobject.c

@@ -2208,7 +2208,11 @@ async_gen_athrow_throw(PyAsyncGenAThrow *o, PyObject *const *args, Py_ssize_t na
 
     retval = gen_throw((PyGenObject*)o->agt_gen, args, nargs);
     if (o->agt_args) {
-        return async_gen_unwrap_value(o->agt_gen, retval);
+        retval = async_gen_unwrap_value(o->agt_gen, retval);
+        if (retval == NULL) {
+            o->agt_state = AWAITABLE_STATE_CLOSED;
+        }
+        return retval;
     } else {
         /* aclose() mode */
         if (retval && _PyAsyncGenWrappedValue_CheckExact(retval)) {
@@ -2228,6 +2232,7 @@ async_gen_athrow_throw(PyAsyncGenAThrow *o, PyObject *const *args, Py_ssize_t na
             */
             PyErr_Clear();
             PyErr_SetNone(PyExc_StopIteration);
+            o->agt_state = AWAITABLE_STATE_CLOSED;
         }
         return retval;
     }