VM: Match language error when attempting to reflectively instantiate an abstract class.

tests/lib/mirrors/instantiate_abstract_class_test.dart

+// Copyright (c) 2013, 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.instantiate_abstract_class;
+
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+
+
+assertInstanitationErrorOnGenerativeConstructors(classMirror) {
+  classMirror.declarations.values.forEach((decl) {
+    if (decl is! MethodMirror) return;
+    if (!decl.isGenerativeConstructor) return;
+    var args = new List(decl.parameters.length);
+    Expect.throws(() => classMirror.newInstance(decl.constructorName, args),
+                  (e) => e is AbstractClassInstantiationError,
+                  '${decl.qualifiedName} should have failed');
+  });
+}
+
+runFactoryConstructors(classMirror) {
+  classMirror.declarations.values.forEach((decl) {
+    if (decl is! MethodMirror) return;
+    if (!decl.isFactoryConstructor) return;
+    var args = new List(decl.parameters.length);
+    classMirror.newInstance(decl.constructorName, args);  // Should not throw.
+  });
+}
+
+abstract class AbstractClass {
+  AbstractClass();
+  AbstractClass.named();
+  factory AbstractClass.named2() => new ConcreteClass();
+}
+
+class ConcreteClass implements AbstractClass {}
+
+main() {
+  assertInstanitationErrorOnGenerativeConstructors(reflectType(num));
+  assertInstanitationErrorOnGenerativeConstructors(reflectType(double));
+  assertInstanitationErrorOnGenerativeConstructors(reflectType(StackTrace));
+
+  assertInstanitationErrorOnGenerativeConstructors(reflectType(AbstractClass));
+  runFactoryConstructors(reflectType(AbstractClass));
+}