def tree_at(line, column)
      # offset = Position.line_char_to_offset(@code, line, column)
      position = Position.new(line, column)
      stack = []
      inner_tree_at @node, position, stack
      stack
    end
def tree_at(line, column)
      # offset = Position.line_char_to_offset(@code, line, column)
      position = Position.new(line, column)
      stack = []
      inner_tree_at @node, position, stack
      stack
    end
Get an array of nodes containing the specified index, starting with the
 nearest node and ending with the root.

 @param line [Integer]
 @param column [Integer]
 @return [Array<AST::Node>]