def format_message(severity, datetime, progname, msg)
      if String === msg then
        msg.inject('') { |s, line| s << super(severity, datetime, progname, line.chomp) }
      else
        super
      end
    end
def format_message(severity, datetime, progname, msg)
      if String === msg then
        msg.inject('') { |s, line| s << super(severity, datetime, progname, line.chomp) }
      else
        super
      end
    end
Writes msg to the log device. Each line in msg is formatted separately.

 @param (see Logger#format_message)
 @return (see Logger#format_message)