iterate_guarding_exceptions

# File activesupport/lib/active_support/notifications/fanout.rb, line 20
        def iterate_guarding_exceptions(collection)
          exceptions = nil

          collection.each do |s|
            yield s
          rescue Exception => e
            exceptions ||= []
            exceptions << e
          end

          if exceptions
            exceptions = exceptions.flat_map do |exception|
              exception.is_a?(InstrumentationSubscriberError) ? exception.exceptions : [exception]
            end
            if exceptions.size == 1
              raise exceptions.first
            else
              raise InstrumentationSubscriberError.new(exceptions), cause: exceptions.first
            end
          end

          collection
        end