Function std::intrinsics::atomic_xsub_relaxed

pub unsafe extern "rust-intrinsic" fn atomic_xsub_relaxed<T>(    dst: *mut T,     src: T) -> T
🔬 This is a nightly-only experimental API. (core_intrinsics #0)intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

Subtract from the current value, returning the previous value. The stabilized version of this intrinsic is available on the std::sync::atomic types via the fetch_sub method by passing Ordering::Relaxed as the order. For example, AtomicIsize::fetch_sub.

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