//! Propagate-down cancellation built on a `std`-only node tree.
//! Cancellation drains local wakers before recursively firing weak children.
modgroup;modnode;modscope;modtoken;modwait;pubusegroup::CancelGroup;pubusescope::CancelScope;pubusetoken::{CancelToken, CancelWakerGuard};pubusewait::Cancelled;