x = x.Deref();
public vValue Union(vDescriptor x) {    if (!(x instanceof vSet)) {	iRuntime.error(120, x);    }    vSet rhs = (vSet) x;    vSet result = new vSet(rhs.t);    java.util.Enumeration i;    i = this.t.keys();    while (i.hasMoreElements()) {	Object o = i.nextElement();	result.t.put(o, o);    }    return result;}