Index: clang/lib/Sema/SemaCoroutine.cpp
===================================================================
--- clang/lib/Sema/SemaCoroutine.cpp
+++ clang/lib/Sema/SemaCoroutine.cpp
@@ -448,8 +448,9 @@
   CallExpr *AwaitSuspend = cast<CallExpr>(Calls.Results[ACT::ACT_Suspend]);
   if (!AwaitSuspend->getType()->isDependentType()) {
     // [expr.await]p3 [...]
-    //   - await-suspend is the expression e.await_suspend(h), which shall be
-    //     a prvalue of type void or bool.
+    //   - await-suspend is the expression e.await_suspend(h), which shall be 
+    //     a prvalue of type void, bool, or std::coroutine_handle<Z> for some
+    //     type Z.
     QualType RetType = AwaitSuspend->getCallReturnType(S.Context);
 
     // Experimental support for coroutine_handle returning await_suspend.