An esoteric Ruby problem

hmm.rb

# Currently writing:
let(:worker_script) do
  <<-EOS
    def nuix_worker_item_callback(worker_item)
      source_item = worker_item.source_item
      if source_item.parent.name =~ /Test Email/
        worker_item.process_embedded = "#{process_embedded}"
      end
    end
  EOS
end

# Want to write:
let_for_heredoc(:worker_script) do
  def nuix_worker_item_callback(worker_item)
    source_item = worker_item.source_item
    if source_item.parent.name =~ /Test Email/
      worker_item.process_embedded = "#{process_embedded}"
    end
  end
end