Replace manual Default impl with educe in tor-cell

use crate::chancell::msg::{DestroyReason, TAP_C_HANDSHAKE_LEN, TAP_S_HANDSHAKE_LEN};

use crate::chancell::CELL_DATA_LEN;

use caret::caret_int;

use educe::Educe;

use std::convert::TryInto;

use std::net::{IpAddr, Ipv4Addr};

use tor_bytes::{Error, Result};

/// A preference for IPv4 vs IPv6 addresses; usable as a nicer frontend for

/// BeginFlags.

#[derive(Clone, Copy, Debug, Eq, PartialEq)]

#[derive(Clone, Copy, Debug, Eq, PartialEq, Educe)]

#[non_exhaustive]

#[educe(Default)]

pub enum IpVersionPreference {

    /// Only IPv4 is allowed.

    Ipv4Only,

    /// IPv4 and IPv6 are both allowed, and IPv4 is preferred.

    #[educe(Default)]

    Ipv4Preferred,

    /// IPv4 and IPv6 are both allowed, and IPv6 is preferred.

    Ipv6Preferred,

        }

    }

}

impl Default for IpVersionPreference {

    fn default() -> Self {

        IpVersionPreference::Ipv4Preferred

    }

}

/// A Begin message creates a new data stream.

///