Fix issue 23500

tests/language/regress_23500_test.dart

Index: tests/language/regress_23500_test.dart
diff --git a/tests/language/regress_23498_test.dart b/tests/language/regress_23500_test.dart
similarity index 78%
copy from tests/language/regress_23498_test.dart
copy to tests/language/regress_23500_test.dart
index ba7a1406d337b5611ea7076fe67760b87009909e..2a5a9fe3d991b9159b819ccc47ab0c4a55286ac7 100644
--- a/tests/language/regress_23498_test.dart
+++ b/tests/language/regress_23500_test.dart
@@ -8,15 +8,13 @@ import "package:expect/expect.dart";
 foo() async {
   try {
     try {
-      await new Future.error('error');
+      await for (var c in new Stream.fromIterable([])) {}  /// 01: ok
+      await 0;  /// 02: ok
     } catch (error) {
-      print("caught once");
-      throw 'error';
     }
   } catch (error) {
-    print("caught twice");
-    throw 'error';
   }
+  throw "error";
 }
 
 main() async {