github.com/gotd/td/tg.UpdateChannelPinnedTopicArray.Retain (method)

one use

	github.com/gotd/td/tg (current package)
		tl_update_slices_gen.go#L9366: func (s UpdateChannelPinnedTopicArray) Retain(keep func(x UpdateChannelPinnedTopic) bool) UpdateChannelPinnedTopicArray {