# File lib/backports/2.5.0/string/delete_prefix.rb, line 20
    def delete_prefix!(prefix)
      prefix = Backports.coerce_to_str(prefix)
      chomp! if frozen?
      len = prefix.length
      if len > 0 && rindex(prefix, 0)
        self[0...prefix.length] = ''
        self
      else
        nil
      end
    end