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: cat.rs
    path of file: ./repos/xsv/src/cmd
    
    the code of the file until where you have to start completion: use csv;

use CliResult;
use config::{Conf
    
    fn cat_rows(&self) -> CliResult<()> {
        let mut row = csv::ByteRecord::new();
        let mut wtr = Config::new(&self.flag_output).writer()?;
        for (i, conf) in self.configs()?.into_iter().enumerate() {
            let mut rdr = conf.reader()?;
            if i == 0 {
                conf.write_headers(&mut rdr, &mut wtr)?;
            }
            while rdr.read_byte_record(&mut row)? {
                wtr.write_byte_record(&row)?;
            }
        }
        wtr.flush().map_err(From::from)
    }