--- raise([error_type,][message][,traceback])

    ΥåɤǶŪ㳰ȯޤ

    ΰ̣ˤĤƤȤ߹ߴؿ raise 򻲾ȤƤ
    

      Thread.new {
        sleep 1
        Thread.main.raise "foobar"
      }

      begin
        sleep
      rescue
        p $!, $@
      end

      => #<RuntimeError: foobar>
         ["-:3"]

