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

one use

	github.com/gotd/td/tg (current package)
		tl_help_promo_data_slices_gen.go#L302: func (s HelpPromoDataArray) Retain(keep func(x HelpPromoData) bool) HelpPromoDataArray {

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