ns := t.Unix()*1e9 + int64(t.Nanosecond())
		return ns == nsec
	}
	f32 := func(nsec int32) bool { return f(int64(nsec)) }
	cfg := &quick.Config{MaxCount: 10000}

	// Try a small date first, then the large ones. (The span is only a few hundred years
	// for nanoseconds in an int64.)
	if err := quick.Check(f32, cfg); err != nil {
		t.Fatal(err)
	}
	if err := quick.Check(f, cfg); err != nil {
		t.Fatal(err)
	}
}

    const std::optional<string>& xla_scope() const { return xla_scope_; }

    // Returns the TF graph node IDs for the resource variable operations in
    // this cluster.
    absl::Span<const int> resource_var_operation_node_ids() const {
      return resource_var_operation_node_ids_;
    }

    string DebugString(const Graph& graph) const {
      Node* node = graph.FindNodeId(cycles_graph_node_id());