Fix for ^= to |=

runtime/lib/isolate.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 "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 168 matching lines @@
         "Unable to canonicalize uri '%s': no library tag handler found.",
         uri.ToCString());
     return false;
   }
   Dart_Handle result = handler(kCanonicalizeUrl,
                                Api::NewHandle(isolate, library.raw()),
                                Api::NewHandle(isolate, uri.raw()));
   const Object& obj = Object::Handle(Api::UnwrapHandle(result));
   if (obj.IsError()) {
     Error& error_obj = Error::Handle();
-    error_obj |= obj.raw();
+    error_obj ^= obj.raw();
     *error = zone->PrintToString("Unable to canonicalize uri '%s': %s",
                                  uri.ToCString(), error_obj.ToErrorCString());
     return false;
   } else if (obj.IsString()) {
     String& string_obj = String::Handle();
     string_obj |= obj.raw();
     *canonical_uri = zone->MakeCopyOfString(string_obj.ToCString());
     return true;
   } else {
     *error = zone->PrintToString("Unable to canonicalize uri '%s': "
@@ skipping 291 matching lines @@
 
 DEFINE_NATIVE_ENTRY(isolate_getPortInternal, 0) {
   const Object& port = Object::Handle(ReceivePortCreate(isolate->main_port()));
   if (port.IsError()) {
     Exceptions::PropagateError(Error::Cast(port));
   }
   return port.raw();
 }
 
 }  // namespace dart