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: temple_line_counter.rb
    path of file: ./repos/hamlit/lib/hamlit
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
module Hamlit
  # A modu
    
    def self.count_lines(exp)
      type, *args = exp
      case type
      when :multi
        args.map { |a| count_lines(a) }.reduce(:+) || 0
      when :dynamic, :code
        args.first.count("\n")
      when :static
        0 # It has not real newline "\n" but escaped "\\n".
      when :case
        arg, *cases = args
        arg.count("\n") + cases.map do |cond, e|
          (cond == :else ? 0 : cond.count("\n")) + count_lines(e)
        end.reduce(:+)
      when :escape
        count_lines(args[1])
      when :newline
        1
      else
        raise UnexpectedExpression.new("[HAML BUG] Unexpected Temple expression '#{type}' is given!")
      end
    end