Throw AbstractClassInstantiationError on abstract classes.

tests/language/abstract_beats_arguments2_test.dart

Index: tests/language/abstract_beats_arguments2_test.dart
diff --git a/tests/language/abstract_beats_arguments2_test.dart b/tests/language/abstract_beats_arguments2_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0bc63c57f446859adf34e795cf73b4db7910f5bf
--- /dev/null
+++ b/tests/language/abstract_beats_arguments2_test.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2017, 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";
+
+abstract class Abstract {
+  Abstract(_);
+}
+
+void main() {
+  Expect.throws(() => new Abstract(throw "argument"), (e) => e == "argument");
+}