Better warning for calling Object#id (because it includes a backtrace)

gistfile1.txt

module BetterObjectIdWarning
  def self.activate
    return if @activated
    @activated = true

    Object.class_eval {
      def id
        return object_id if @in_object_id_warning
        
        @in_object_id_warning = true
        begin
          backtrace = caller.reject { |line| line =~ /\/gems\// }[0,8]
          STDERR.puts "*** Calling Object#id for\n\t#{inspect}\n    from\n\t#{backtrace.join("\n\t")}"
          object_id
        ensure
          @in_object_id_warning = nil
        end
      end
    }
  end
end

BetterObjectIdWarning.activate