Implement factory call.

runtime/vm/object.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 "vm/object.h"
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 2834 matching lines @@
     ASSERT(!other_type.IsNull());
     if (!type.IsMoreSpecificThan(other_type, malformed_error)) {
       return false;
     }
   }
   return true;
 }
 
 
 const char* AbstractTypeArguments::ToCString() const {
-  // AbstractTypeArguments is an abstract class.
+  // AbstractTypeArguments is an abstract class, valid only for representing
+  // null.
+  if (IsNull()) {
+    return "NULL AbstractTypeArguments";
+  }
   UNREACHABLE();
   return "AbstractTypeArguments";
 }
 
 
 intptr_t TypeArguments::Length() const {
   ASSERT(!IsNull());
   return Smi::Value(raw_ptr()->length_);
 }
 
@@ skipping 5966 matching lines @@
   result.set_num_args_tested(num_args_tested);
   // Number of array elements in one test entry (num_args_tested + 1)
   intptr_t len = result.TestEntryLength();
   // IC data array must be null terminated (sentinel entry).
   const Array& ic_data = Array::Handle(Array::New(len, Heap::kOld));
   result.set_ic_data(ic_data);
   return result.raw();
 }
 
 }  // namespace dart