Field should not be initialized until after initializer returns

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 "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 7858 matching lines @@
     if (value.IsError()) {
       SetStaticValue(Object::null_instance());
       Exceptions::PropagateError(Error::Cast(value));
       UNREACHABLE();
     }
     ASSERT(value.IsNull() || value.IsInstance());
     SetStaticValue(value.IsNull() ? Instance::null_instance()
                                   : Instance::Cast(value));
     return;
   } else if (StaticValue() == Object::transition_sentinel().raw()) {
-    SetStaticValue(Object::null_instance());
     const Array& ctor_args = Array::Handle(Array::New(1));
     const String& field_name = String::Handle(name());
     ctor_args.SetAt(0, field_name);
     Exceptions::ThrowByType(Exceptions::kCyclicInitializationError, ctor_args);
     UNREACHABLE();
     return;
   }
   UNREACHABLE();
 }
 
@@ skipping 15127 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart