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: mod.rs
    path of file: ./repos/webrtc/dtls/src/record_layer
    
    the code of the file until where you have to start completion: pub mod record_layer_header;

#[cfg(test)]
mod record_layer_test;

use std::io::{Read, Write};

use record_layer_header::*;

use super::content::*;
use super::error::*;
use crate::alert::Alert;
use crate::application_data::ApplicationData;
use crate::change_cipher_spec::ChangeCipherSpec;
use crate::handshake::Handshake;

/*
 The TLS Record Layer which handles al
    
    pub fn new(protocol_version: ProtocolVersion, epoch: u16, content: Content) -> Self {
        RecordLayer {
            record_layer_header: RecordLayerHeader {
                content_type: content.content_type(),
                protocol_version,
                epoch,
                sequence_number: 0,
                content_len: content.size() as u16,
            },
            content,
        }
    }