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

one use

	github.com/gotd/td/tg (current package)
		tl_phone_call_discard_reason_slices_gen.go#L57: func (s PhoneCallDiscardReasonClassArray) Retain(keep func(x PhoneCallDiscardReasonClass) bool) PhoneCallDiscardReasonClassArray {