Allow named parameters in const constructor invocations.

tests/language/src/NamedArgumentInConstCreationTest.dart

Index: tests/language/src/NamedArgumentInConstCreationTest.dart
diff --git a/tests/language/src/NamedArgumentInConstCreationTest.dart b/tests/language/src/NamedArgumentInConstCreationTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..cd53423365e6ffe8adab3ce70c36fd11724f17d3
--- /dev/null
+++ b/tests/language/src/NamedArgumentInConstCreationTest.dart
@@ -0,0 +1,16 @@
+// Copyright (c) 2012, 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.
+
+class A {
+  final x;
+  final y;
+  const A(a, [b]) : x = a, y = b;
+  static final test = const A(1, b: 2);
+}
+
+main() {
+  A a = A.test;
+  Expect.equals(1, a.x);
+  Expect.equals(2, a.y);
+}