message: Delete CASTConverter::label_node_map
diff: @@ -425,8 +425,6 @@ struct CASTConverter<'a> {
  ast: &'a SimpleCAST,
  /// HashMap from SimpleCAST's node to CAST's node
  node_map: HashMap<NodeIndex, NodeIndex>,
  - /// HashMap from ActionNode to label node
  - label_node_map: HashMap<NodeIndex, NodeIndex>,
  visited: HashSet<NodeIndex>,
  }
  @@ -435,7 +433,6 @@ impl<'a> CASTConverter<'a> {
  CASTConverter {
  ast: ast,
  node_map: HashMap::new(),
  - label_node_map: HashMap::new(),
  visited: HashSet::new(),
  }
  }
  