addrs, _ := r.Val.([]IPAddr)
			trace.DNSDone(ipAddrsEface(addrs), r.Shared, err)
		}
		return lookupIPReturn(r.Val, err, r.Shared)
	}
}

// lookupIPReturn turns the return values from singleflight.Do into
// the return values from LookupIP.
func lookupIPReturn(addrsi any, err error, shared bool) ([]IPAddr, error) {
	if err != nil {
		return nil, err
	}
	addrs := addrsi.([]IPAddr)