Fixes #246

test/checker/checker_test.dart

Index: test/checker/checker_test.dart
diff --git a/test/checker/checker_test.dart b/test/checker/checker_test.dart
index 1a2cf7a3040c4bc7ba4203ff7dabb0892ba94dd4..374da04ad460449f4d2c715707193052f5d0027c 100644
--- a/test/checker/checker_test.dart
+++ b/test/checker/checker_test.dart
@@ -2686,6 +2686,16 @@ void main() {
         Future bar2() async { return x; }
         Future<int> bar3() async { return (/*info:DynamicCast*/x); }
         Future<int> bar4() async { return (/*severe:StaticTypeError*/new Future<int>(x)); }
+
+        int y;
+        Future<int> z;
+
+        void baz() async {
+          int a = /*info:DynamicCast*/await /*info:DynamicCast*/x;
+          int b = await /*severe:StaticTypeError*/y;
+          int c = await z;
+          String d = /*severe:StaticTypeError*/await z;
+        }
     '''
     }));