slowDst6 = "2001:2::254"
)

// In some environments, the slow IPs may be explicitly unreachable, and fail
// more quickly than expected. This test hook prevents dialTCP from returning
// before the deadline.
func slowDialTCP(ctx context.Context, network string, laddr, raddr *TCPAddr) (*TCPConn, error) {
	sd := &sysDialer{network: network, address: raddr.String()}
	c, err := sd.doDialTCP(ctx, laddr, raddr)