You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: a.rs
    path of file: ./repos/dog/dns/src/record
    
    the code of the file until where you have to start completion: use std::net::Ipv4Addr;

use log::*;

use crate::wire::*;


/// An **A** record type, which contains an `Ipv4Address`.
///
/// # References
///
/// - [RFC 1035 §3.4.1](https://tools.ietf.org/html/rfc1035) — Domain Names,
///   Implementation and Specification (November 1987)
#[derive(PartialEq, Debug, Copy, Clone)]
pub struct A {

    /// The IPv4 address contained in the packet.
    pub address: Ipv4Addr,
}

impl Wire for A {
    const N
    
    fn read(stated_length: u16, c: &mut Cursor<&[u8]>) -> Result<Self, WireError> {
        if stated_length != 4 {
            warn!("Length is incorrect (record length {:?}, but should be four)", stated_length);
            let mandated_length = MandatedLength::Exactly(4);
            return Err(WireError::WrongRecordLength { stated_length, mandated_length });
        }

        let mut buf = [0_u8; 4];
        c.read_exact(&mut buf)?;

        let address = Ipv4Addr::from(buf);
        trace!("Parsed IPv4 address -> {:?}", address);

        Ok(Self { address })
    }