ToNode
if (Node *node = ToNode()) {
if (Node *node = ToNode()) {
if (Node *node = const_cast<Block*>(this)->ToNode())
if (Node *node = const_cast<Block*>(this)->ToNode())
Node *ToNode();
*node = block->ToNode();
error = fTree->Init(this, rootBlock->ToNode(),
Node* node = entry->ToNode();
*_node = entry->ToNode();
virtual ::Node* ToNode() = 0;