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

one use

	github.com/gotd/td/tg (current package)
		tl_update_slices_gen.go#L9448: func (s UpdateChannelPinnedTopicsArray) Retain(keep func(x UpdateChannelPinnedTopics) bool) UpdateChannelPinnedTopicsArray {