List constructor sentinel must not implement 'int'

tests/lib/mirrors/constructor_optional_args_test.dart

+// Copyright (c) 2016, 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.
+
+library test.constructor_test;
+
+@MirrorsUsed(targets: const [A])
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+
+class A {
+  factory A([x, y]) = B;
+  factory A.more([x, y]) = B.more;
+  factory A.oneMore(x, [y]) = B.more;
+}
+
+class B implements A {
+  final _x, _y, _z;
+
+  B([x = 'x', y = 'y']) : _x = x, _y = y;
+
+  B.more([x = 'x', y = 'y', z = 'z']) : _x = x, _y = y, _z = z;
+
+  toString() => 'B(x=$_x, y=$_y, z=$_z)';
+}
+
+
+main() {
+  var d1 = new A(1);
+  Expect.equals('B(x=1, y=y, z=null)', '$d1', 'direct 1');
+
+  var d2 = new A.more(1);
+  Expect.equals('B(x=1, y=y, z=z)', '$d2', 'direct 2');
+
+  ClassMirror cm = reflectClass(A);
+
+  var v1 = cm.newInstance(const Symbol(''), []).reflectee;
+  var v2 = cm.newInstance(const Symbol(''), [1]).reflectee;
+  var v3 = cm.newInstance(const Symbol(''), [2, 3]).reflectee;
+
+  Expect.equals('B(x=x, y=y, z=null)', '$v1', 'unnamed 1');
+  Expect.equals('B(x=1, y=y, z=null)', '$v2', 'unnamed 2');
+  Expect.equals('B(x=2, y=3, z=null)', '$v3', 'unnamed 3');
+
+  var m1 = cm.newInstance(const Symbol('more'), []).reflectee;
+  var m2 = cm.newInstance(const Symbol('more'), [1]).reflectee;
+  var m3 = cm.newInstance(const Symbol('more'), [2, 3]).reflectee;
+
+  Expect.equals('B(x=x, y=y, z=z)', '$m1', 'more 1');
+  Expect.equals('B(x=1, y=y, z=z)', '$m2', 'more 2');
+  Expect.equals('B(x=2, y=3, z=z)', '$m3', 'more 3');
+
+  var o1 = cm.newInstance(const Symbol('oneMore'), [1]).reflectee;
+  var o2 = cm.newInstance(const Symbol('oneMore'), [2, 3]).reflectee;
+
+  Expect.equals('B(x=1, y=y, z=z)', '$o1', 'oneMore one arg');
+  Expect.equals('B(x=2, y=3, z=z)', '$o2', 'oneMore two args');
+}