// newDNSError creates a new *DNSError.
// Based on the err, it sets the UnwrapErr, IsTimeout, IsTemporary, IsNotFound fields.
func newDNSError(err error, name, server string) *DNSError {
	var (
		isTimeout   bool
		isTemporary bool
		unwrapErr   error
	)

	if err, ok := err.(Error); ok {
		isTimeout = err.Timeout()
		isTemporary = err.Temporary()
	}