- i->first->id().print (buf, sizeof (buf));
- can->add_property (X_("copy"), buf);
- i->second->id().print (buf, sizeof (buf));
- can->add_property (X_("original"), buf);
+ can->add_property (X_("copy"), i->first->id().to_s());
+ can->add_property (X_("original"), i->second->id().to_s());