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: decode.rs
    path of file: ./repos/flac/examples
    
    the code of the file until where you have to start completion: extern crate docopt;
extern crate flac;
extern crate hound;
extern crate rustc_serialize;

use docopt::Docopt;
use flac::{ErrorKind, StreamReader};

use std::env;
use std::fs;
use st
    
fn to_io_error(kind: ErrorKind) -> hound::Error {
  match kind {
    ErrorKind::IO(e) => {
      let io_error = io::Error::new(e, "io error");

      hound::Error::IoError(io_error)
    }
    _                => hound::Error::Unsupported,
  }
}