You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: list.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/sample
    
    the code of the file until where you have to start completion: # Linked list example
class MyElem
  # object initializer call
    
  def add_to_list(obj)
    elt = MyElem.new(obj)
    if @head
      @tail.succ = elt
    else
      @head = elt
    end