Function std::intrinsics::atomic_cxchgweak_failacq

pub unsafe extern "rust-intrinsic" fn atomic_cxchgweak_failacq<T>(    dst: *mut T,     old: T,     src: T) -> (T, bool) where    T: Copy, 
🔬 This is a nightly-only experimental API. (core_intrinsics)intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

Stores a value if the current value is the same as the old value.

The stabilized version of this intrinsic is available on the atomic types via the compare_exchange_weak method by passing Ordering::SeqCst as the success and Ordering::Acquire as the failure parameters. For example, AtomicBool::compare_exchange_weak.

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