Create more synthetic kernel objects.

pkg/front_end/testcases/inference/abstract_class_instantiation.dart

Index: pkg/front_end/testcases/inference/abstract_class_instantiation.dart
diff --git a/pkg/front_end/testcases/inference/abstract_class_instantiation.dart b/pkg/front_end/testcases/inference/abstract_class_instantiation.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f09570b364ddd208a83d6ae308078fa335938bc5
--- /dev/null
+++ b/pkg/front_end/testcases/inference/abstract_class_instantiation.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/*@testedFeatures=inference*/
+library test;
+
+abstract class C {}
+
+abstract class D<T> {
+  D(T t);
+}
+
+void test() {
+  var /*@type=C*/ x = new C();
+  var /*@type=D<int>*/ y = new /*@typeArgs=int*/ D(1);
+  D<List<int>> z = new /*@typeArgs=List<int>*/ D(/*@typeArgs=int*/ []);
+}
+
+main() {}