text: // A Set iterator keeps the data alive.
  
  load(libdir + "referencesVia.js");
  load(libdir + "iteration.js");
  
  var key = {};
  var set = Set([key]);
  var iter = set[std_iterator]();
  referencesVia(iter, "**UNKNOWN SLOT 0**", set);
  referencesVia(set, "key", key);
  