Handle default values on constant redirecting factories.

tests/language/const_redirecting_factory_test.dart

Index: tests/language/const_redirecting_factory_test.dart
diff --git a/tests/language/const_redirecting_factory_test.dart b/tests/language/const_redirecting_factory_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..870a2200dc6dcc882b3443a19b59e8c111f57072
--- /dev/null
+++ b/tests/language/const_redirecting_factory_test.dart
@@ -0,0 +1,58 @@
+// Copyright (c) 2015, 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.
+
+import 'package:expect/expect.dart';
+
+class K implements L {
+  final field1;
+  final field2;
+  const K({this.field1: 42, this.field2: true});
+}
+
+class L {
+  const factory L() = K;
+  const factory L.named1({field1, field2}) = K;
+  const factory L.named2({field2, field1}) = K;
+}
+
+const l1 = const L();
+
+const l2a = const L.named1();
+const l2b = const L.named1(field1: 87);
+const l2c = const L.named1(field2: false);
+const l2d = const L.named1(field1: 87, field2: false);
+const l2e = const L.named1(field2: false, field1: 87);
+
+const l3a = const L.named2();
+const l3b = const L.named2(field1: 87);
+const l3c = const L.named2(field2: false);
+const l3d = const L.named2(field1: 87, field2: false);
+const l3e = const L.named2(field2: false, field1: 87);
+
+main() {
+  Expect.equals(42, l1.field1);
+  Expect.equals(true, l1.field2);
+
+  Expect.equals(42, l2a.field1);
+  Expect.equals(true, l2a.field2);
+  Expect.equals(87, l2b.field1);
+  Expect.equals(true, l2b.field2);
+  Expect.equals(42, l2c.field1);
+  Expect.equals(false, l2c.field2);
+  Expect.equals(87, l2d.field1);
+  Expect.equals(false, l2d.field2);
+  Expect.equals(87, l2e.field1);
+  Expect.equals(false, l2e.field2);
+
+  Expect.equals(42, l3a.field1);
+  Expect.equals(true, l3a.field2);
+  Expect.equals(87, l3b.field1);
+  Expect.equals(true, l3b.field2);
+  Expect.equals(42, l3c.field1);
+  Expect.equals(false, l3c.field2);
+  Expect.equals(87, l3d.field1);
+  Expect.equals(false, l3d.field2);
+  Expect.equals(87, l3e.field1);
+  Expect.equals(false, l3e.field2);
+}