Implement newInstance in the transformer.

test_reflectable/test/new_instance_default_values_test.dart

Index: test_reflectable/test/new_instance_default_values_test.dart
diff --git a/test_reflectable/test/new_instance_default_values_test.dart b/test_reflectable/test/new_instance_default_values_test.dart
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+++ b/test_reflectable/test/new_instance_default_values_test.dart
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+// Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+// File being transformed by the reflectable transformer.
+// Uses `invoke`.
+
+library reflectable.test.to_be_transformed.new_instance_test;
+
+import 'package:reflectable/reflectable.dart';
+import 'package:unittest/unittest.dart';
+
+class MyReflectable extends Reflectable {
+  const MyReflectable() : super(newInstanceCapability);
+}
+
+const myReflectable = const MyReflectable();
+
+@myReflectable
+class A {
+  static const localConstant = 10;
+  A.optional([int z = localConstant]) : f = z;
+  int f = 0;
+}
+
+main() {
+  ClassMirror classMirror = myReflectable.reflectType(A);
+  test('newInstance named arguments default argument, local constant', () {
+    expect((classMirror.newInstance("optional", [], {}) as A).f, 10);
+  });
+}