inspect

# File lib/csv.rb, line 1961
  def inspect
    str = ["<#", self.class.to_s, " io_type:"]
    # show type of wrapped IO
    if    @io == $stdout then str << "$stdout"
    elsif @io == $stdin  then str << "$stdin"
    elsif @io == $stderr then str << "$stderr"
    else                      str << @io.class.to_s
    end
    # show IO.path(), if available
    if @io.respond_to?(:path) and (p = @io.path)
      str << " io_path:" << p.inspect
    end
    # show encoding
    str << " encoding:" << @encoding.name
    # show other attributes
    ] lineno     col_sep     row_sep
        quote_char skip_blanks liberal_parsing ].each do |attr_name|
      if a = instance_variable_get("@#{attr_name}")
        str << " " << attr_name << ":" << a.inspect
      end
    end
    if @use_headers
      str << " headers:" << headers.inspect
    end
    str << ">"
    begin
      str.join('')
    rescue  # any encoding error
      str.map do |s|
        e = Encoding::Converter.asciicompat_encoding(s.encoding)
        e ? s.encode(e) : s.force_encoding("ASCII-8BIT")
      end.join('')
    end
  end