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: keccak.rs
    path of file: ./repos/redshirt/kernel/core/benches
    
    the code of the file until where you have to start completion: // Copyright (C) 2019-2021  Pierre Krieger
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use criterion::{criterion_group, criterion_main, Criterion};
use redshirt_core::{extrinsics::wasi::WasiExtrinsics, Module, SystemBuilder, SystemRunOutcome};

fn bench(c: &mut Criterion) {
    /* Original code:
    #![feature(alloc_error_handler)]
    #![no_std]
    #![no_main]

    #[global_allocator]
    static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

    #[cfg(not(any(test, doc, doctest)))]
    #[panic_handler]
    fn panic(_: &core::panic::PanicInfo) -> ! {
        unsafe { core::hint::unreachable_unchecked() }
    }

    #[cfg(not(any(test, doc, doctest)))]
    #[alloc_error_handler]
    fn alloc_error_handler(_: core::alloc::Layout) -> ! {
        panic!()
    }

    extern crate alloc;
    use alloc::vec;
    use futures::prelude::*;
    use tiny_keccak::*;

    #[no_mangle]
    fn _start() {
        let data = [254u8; 4096];

  
    
fn bench(c: &mut Criterion) {
    /* Original code:
    #![feature(alloc_error_handler)]
    #![no_std]
    #![no_main]

    #[global_allocator]
    static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

    #[cfg(not(any(test, doc, doctest)))]
    #[panic_handler]
    fn panic(_: &core::panic::PanicInfo) -> ! {
        unsafe { core::hint::unreachable_unchecked() }
    }

    #[cfg(not(any(test, doc, doctest)))]
    #[alloc_error_handler]
    fn alloc_error_handler(_: core::alloc::Layout) -> ! {
        panic!()
    }

    extern crate alloc;
    use alloc::vec;
    use futures::prelude::*;
    use tiny_keccak::*;

    #[no_mangle]
    fn _start() {
        let data = [254u8; 4096];

        let mut res: [u8; 32] = [0; 32];
        let mut keccak = tiny_keccak::Keccak::v256();
        keccak.update(&data);
        keccak.finalize(&mut res);

        assert_ne!(res[0] as isize, 0);
    }
    */
    let module = Module::from_bytes(&include_bytes!("keccak.wasm")[..]).unwrap();

    c.bench_function("keccak-wasm-4096-bytes", |b| {
        let system = SystemBuilder::<WasiExtrinsics>::new([0; 64])
            .build()
            .unwrap();
        b.iter(|| {
            system.execute(&module).unwrap();
            futures::executor::block_on(async {
                loop {
                    match system.run().await {
                        SystemRunOutcome::ProgramFinished { outcome, .. } => break outcome,
                        _ => panic!(),
                    }
                }
            })
            .unwrap();
        })
    });

    c.bench_function("keccak-native-4096-bytes", |b| {
        b.iter(|| {
            use tiny_keccak::*;

            let data = [254u8; 4096];

            let mut res: [u8; 32] = [0; 32];
            let mut keccak = tiny_keccak::Keccak::v256();
            keccak.update(&data);
            keccak.finalize(&mut res);

            assert_ne!(res[0] as isize, 0);
        })
    });
}