Ascribe erroneous constructors to the resolved element.

tests/compiler/dart2js/serialization/test_data.dart

Index: tests/compiler/dart2js/serialization/test_data.dart
diff --git a/tests/compiler/dart2js/serialization/test_data.dart b/tests/compiler/dart2js/serialization/test_data.dart
index 065bf660d0d43675dbb7669e179d9f3204a7fa91..04f8fd1eb6694921081c7591bb9116cb5e36fca7 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -693,6 +693,12 @@ const a = 1e+400;
 main() => a;
 ''',
   }),
+
+  const Test('Erroneous constructor', const {},
+      preserializedSourceFiles: const {
+    'main.dart': '''
+main() => new Null();
+'''}),
 ];
 
 class Test {