Use default values of named arguments when invoking the default super constructor.

tests/language/src/CompileTimeConstantPTest.dart

Index: tests/language/src/CompileTimeConstantPTest.dart
diff --git a/tests/language/src/CompileTimeConstantPTest.dart b/tests/language/src/CompileTimeConstantPTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4c2871021063c9b7ea2f14263e34010699b7d066
--- /dev/null
+++ b/tests/language/src/CompileTimeConstantPTest.dart
@@ -0,0 +1,19 @@
+// 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 {
+  const A(
+    this.x  /// 01: compile-time error
+  );
+  final x;
+}
+
+class B extends A {
+}
+
+var b = const B();
+
+main() {
+  Expect.equals(null, b.x);
+}