# File lib/em/deferrable.rb, line 61 61: def errback &block 62: return unless block 63: @deferred_status ||= :unknown 64: if @deferred_status == :failed 65: block.call(*@deferred_args) 66: elsif @deferred_status != :succeeded 67: @errbacks ||= [] 68: @errbacks.unshift block # << block 69: end 70: end