# File lib/pry/indent.rb, line 254
    def track_delimiter(token)
      case token
      when /^<<-(["'`]?)(.*)\\1/
        @heredoc_queue << token
        @close_heredocs[token] = /^\s*$2/
      when @close_heredocs[@heredoc_queue.first]
        @heredoc_queue.shift
      else
        if @string_start
          @string_start = nil
        else
          @string_start = token
        end
      end
    end