module Sync_m

def sync_inspect
  sync_iv = instance_variables.select{|iv| /^@sync_/ =~ iv.id2name}.collect{|iv| iv.id2name + '=' + instance_eval(iv.id2name).inspect}.join(",")
  print "<#{self.class}.extend Sync_m: #{inspect}, <Sync_m: #{sync_iv}>"
end