vendor/futures-core/src/task/__internal/mod.rs

#[cfg_attr(target_os = "none", cfg(any(target_has_atomic = "ptr", feature = "portable-atomic")))]
mod atomic_waker;
#[cfg_attr(
    target_os = "none",
    cfg(any(target_has_atomic = "ptr", feature = "portable-atomic"))
)]
pub use self::atomic_waker::AtomicWaker;