module ActiveSupport::Rescuable::ClassMethods

def find_rescue_handler(exception)
  if exception
    # Handlers are in order of declaration but the most recently declared
    # is the highest priority match, so we search for matching handlers
    # in reverse.
    _, handler = rescue_handlers.reverse_each.detect do |class_or_name, _|
      if klass = constantize_rescue_handler_class(class_or_name)
        klass === exception
      end
    end
    handler
  end
end