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: main.rs
    path of file: ./repos/kani/tests/kani/Intrinsics/Atomic/Stable/CompareExchange
    
    the code of the file until where you have to start completion: // Copyright Kani Contributors
// SPDX-License-Identifier: Apache-2.0 OR MIT

// Check that `atomic_cxchg` and other variants (stable version) return the
// expected result.

use std::sync::atomic::{AtomicBool, Ordering};

#[kani::proof]
fn main() {
    // pub fn compare_exchange(
    //     &self,
    //     current: bool,
    //     new: bool,
    //     success: Ordering,
    //     failure: Ordering
    // ) -> Result<bool, bool>
    // Stores a value into the bool if the current value is the same
    // as the current value.
    // The return value is a result indicating whether the new value
    // was written and containing the previous value. On success this
    // value is guaranteed to be equal to current.
    let a1 = AtomicBool::new(true);
    let a2 = AtomicBool::new(true);
    let a3 = AtomicBool::new(true);
    let a4 = AtomicBool::new(true);
    let a5 = AtomicBool::new(true);
    let a6 = AtomicBool::new(true);
    let a7 = AtomicBool::new(true);
    let a8 = AtomicBool::new(true);
    let a
    
fn main() {
    // pub fn compare_exchange(
    //     &self,
    //     current: bool,
    //     new: bool,
    //     success: Ordering,
    //     failure: Ordering
    // ) -> Result<bool, bool>
    // Stores a value into the bool if the current value is the same
    // as the current value.
    // The return value is a result indicating whether the new value
    // was written and containing the previous value. On success this
    // value is guaranteed to be equal to current.
    let a1 = AtomicBool::new(true);
    let a2 = AtomicBool::new(true);
    let a3 = AtomicBool::new(true);
    let a4 = AtomicBool::new(true);
    let a5 = AtomicBool::new(true);
    let a6 = AtomicBool::new(true);
    let a7 = AtomicBool::new(true);
    let a8 = AtomicBool::new(true);
    let a9 = AtomicBool::new(true);

    // `compare_exchange` is the stable version of `atomic_cxchg`
    // https://doc.rust-lang.org/src/core/sync/atomic.rs.html#1094-1115
    // https://doc.rust-lang.org/src/core/sync/atomic.rs.html#2410-2437
    // Combinations other than the ones included here result in panic
    assert!(a1.compare_exchange(true, false, Ordering::Acquire, Ordering::Acquire) == Ok(true));
    assert!(a2.compare_exchange(true, false, Ordering::Release, Ordering::Relaxed) == Ok(true));
    assert!(a3.compare_exchange(true, false, Ordering::AcqRel, Ordering::Acquire) == Ok(true));
    assert!(a4.compare_exchange(true, false, Ordering::Relaxed, Ordering::Relaxed) == Ok(true));
    assert!(a5.compare_exchange(true, false, Ordering::SeqCst, Ordering::SeqCst) == Ok(true));
    assert!(a6.compare_exchange(true, false, Ordering::Acquire, Ordering::Relaxed) == Ok(true));
    assert!(a7.compare_exchange(true, false, Ordering::AcqRel, Ordering::Relaxed) == Ok(true));
    assert!(a8.compare_exchange(true, false, Ordering::SeqCst, Ordering::Relaxed) == Ok(true));
    assert!(a9.compare_exchange(true, false, Ordering::SeqCst, Ordering::Acquire) == Ok(true));

    assert!(a1.load(Ordering::Relaxed) == false);
    assert!(a2.load(Ordering::Relaxed) == false);
    assert!(a3.load(Ordering::Relaxed) == false);
    assert!(a4.load(Ordering::Relaxed) == false);
    assert!(a5.load(Ordering::Relaxed) == false);
    assert!(a6.load(Ordering::Relaxed) == false);
    assert!(a7.load(Ordering::Relaxed) == false);
    assert!(a8.load(Ordering::Relaxed) == false);
    assert!(a9.load(Ordering::Relaxed) == false);
}