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

runtime/lib/mirrors.cc

 // 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.
 
 #include "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
@@ skipping 1694 matching lines @@
     // so as to produce the same NoSuchMethodError as the non-reflective case.
     lookup_constructor = Function::null();
     ThrowNoSuchMethod(AbstractType::Handle(klass.RareType()),
                       internal_constructor_name,
                       lookup_constructor,
                       InvocationMirror::kConstructor,
                       InvocationMirror::kMethod);
     UNREACHABLE();
   }
 
+  if (klass.is_abstract() && !lookup_constructor.IsFactory()) {
+    const Array& error_args = Array::Handle(Array::New(3));
+    error_args.SetAt(0, klass_name);
+    // 1 = script url
+    // 2 = token position
+    Exceptions::ThrowByType(Exceptions::kAbstractClassInstantiation,
+                            error_args);
+    UNREACHABLE();
+  }
+
   ASSERT(!type.IsNull());
   AbstractTypeArguments& type_arguments =
       AbstractTypeArguments::Handle(type.arguments());
   if (!type.IsInstantiated()) {
     // Must have been a declaration type.
     AbstractType& rare_type = AbstractType::Handle(klass.RareType());
     ASSERT(rare_type.IsInstantiated());
     type_arguments = rare_type.arguments();
   }
 
@@ skipping 327 matching lines @@
 
 DEFINE_NATIVE_ENTRY(VariableMirror_type, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(MirrorReference, ref, arguments->NativeArgAt(0));
   const Field& field = Field::Handle(ref.GetFieldReferent());
   GET_NATIVE_ARGUMENT(AbstractType, instantiator, arguments->NativeArgAt(1));
   const AbstractType& type = AbstractType::Handle(field.type());
   return InstantiateType(type, instantiator);
 }
 
 }  // namespace dart