fn cancel(group: Group, ev: *Evented, maybe_awaiter: ?*Fiber) bool
group: Group
ev: *Evented
maybe_awaiter: ?*Fiber
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fn cancel(group: Group, ev: *Evented, maybe_awaiter: ?*Fiber) bool { group.lock(ev); defer group.unlock(ev); return group.cancelLocked(ev, maybe_awaiter); }