Fraction class prototype and test (not to be committed).

runtime/vm/exceptions.cc

 // Copyright (c) 2011, 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/exceptions.h"
 
 #include "platform/address_sanitizer.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 700 matching lines @@
       constructor_name = &Symbols::DotCreate();
       break;
     case kCyclicInitializationError:
       library = Library::CoreLibrary();
       class_name = &Symbols::CyclicInitializationError();
   }
 
   return DartLibraryCalls::InstanceCreate(library,
                                           *class_name,
                                           *constructor_name,
+                                          false,  // Not a factory.
                                           arguments);
 }
 
 
 }  // namespace dart