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/rust-dangerous/src/input/bytes
    
    the code of the file until where you have to start completion: mod array;
mod pattern;
mod prefix;

use core::slice::Iter as SliceIter;
use core::{iter, str};

use crate::display::InputDisplay;
use crate::error::{
    with_context, Cor
    
    fn verify_token_boundary(&self, index: usize) -> Result<(), CoreExpected> {
        if index > self.len() {
            Err(CoreExpected::EnoughInputFor("byte index"))
        } else {
            Ok(())
        }
    }