pub type WeakEventSubscriberHandler<A> = dyn for<'s, 'v, 'r, 'a> Fn(Option<&'s dyn Any>, &'v dyn Any, &'r <A as WeakEventArgs>::Args<'a>);Expand description
The signature of a handler of WeakEventSubscriber::event and of the
dispatch function of a TargetWeakEventSubscriber (after its target).