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: components.rs
    path of file: ./repos/icu4x/utils/zerovec/src/varzerovec
    
    the code of the file until where you have to start completion: // This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

use crate::ule::*;
use alloc::boxed::Box;
use alloc::format;
use alloc::string::String;
use alloc::vec::Vec;
use core::cmp::Ordering;
use core::convert::TryFrom;
use core::marker::PhantomData;
use core::ops::Range;

// Also used by owned.rs
pub(super) const LENGTH_WIDTH: usize = 4;
pub(super) const METADATA_WIDTH: usize = 0;
pub(super) const MAX_LENGTH: usize = u32::MAX as usize;
pub(super) const MAX_INDEX: usize = u32::MAX as usize;

/// This trait allows switching between different possible internal
/// representations of VarZeroVec.
///
/// Currently this crate supports two formats: [`Index16`] and [`Index32`],
/// with [`Index16`] being the default for all [`VarZeroVec`](super::VarZeroVec)
/// types unless explicitly specified otherwise.
///
/// Do not implement this trait, its internals 
    
    pub unsafe fn from_bytes_unchecked(slice: &'a [u8]) -> Self {
        // The empty VZV is special-cased to the empty slice
        if slice.is_empty() {
            return VarZeroVecComponents {
                len: 0,
                indices: &[],
                things: &[],
                entire_slice: slice,
                marker: PhantomData,
            };
        }
        let len_bytes = slice.get_unchecked(0..LENGTH_WIDTH);
        let len_ule = RawBytesULE::<LENGTH_WIDTH>::from_byte_slice_unchecked(len_bytes);

        let len = len_ule.get_unchecked(0).as_unsigned_int();
        let indices_bytes = slice.get_unchecked(
            LENGTH_WIDTH + METADATA_WIDTH
                ..LENGTH_WIDTH + METADATA_WIDTH + F::INDEX_WIDTH * (len as usize),
        );
        let things =
            slice.get_unchecked(LENGTH_WIDTH + METADATA_WIDTH + F::INDEX_WIDTH * (len as usize)..);

        VarZeroVecComponents {
            len,
            indices: indices_bytes,
            things,
            entire_slice: slice,
            marker: PhantomData,
        }
    }