// "predict" closeNotify alerts.
	c.rawInput.Grow(needs + bytes.MinRead)
	_, err := c.rawInput.ReadFrom(&atLeastReader{r, int64(needs)})
	return err
}

// sendAlertLocked sends a TLS alert message.
func (c *Conn) sendAlertLocked(err alert) error {
	if c.quic != nil {
		return c.out.setErrorLocked(&net.OpError{Op: "local error", Err: err})
	}

	switch err {
	case alertNoRenegotiation, alertCloseNotify: