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: record.rs
    path of file: ./repos/vector/lib/vector-buffers/src/variants/disk_v2/tests
    
    the code of the file until where you have to start completion: use std::io::Cursor;

use crate::{
    test::SizedRecord,
    variants::disk_v2::{reader::RecordReader, wr
    
async fn record_reader_always_returns_none_when_no_data() {
    let reader_io = Cursor::new(Vec::new());

    let mut record_reader = RecordReader::<_, SizedRecord>::new(reader_io);
    let read_token = record_reader
        .try_next_record(false)
        .await
        .expect("read should not fail");
    assert!(read_token.is_none());
}