# File lib/ruby2ruby.rb, line 442
  def process_for(exp)
    recv = process exp.shift
    iter = process exp.shift
    body = exp.empty? ? nil : process(exp.shift)

    result = ["for #{iter} in #{recv} do"]
    result << indent(body ? body : "# do nothing")
    result << "end"

    result.join("\n")
  end