return (*hchan)(efaceOf(&t.arg).data)
}

// updateHeap updates t as directed by t.state, updating t.state
// and returning a bool indicating whether the state (and ts.heap[0].when) changed.
// The caller must hold t's lock, or the world can be stopped instead.
// The timer set t.ts must be non-nil and locked, t must be t.ts.heap[0], and updateHeap
// takes care of moving t within the timers heap to preserve the heap invariants.