You can only use an effect if somewhere up the call stack there is a place where that effect will be handled. In Java you need a catch around every throw, even if for runtime exceptions you can skirt around this slightly. In languages with async/await you must decorate a call to an async function with await, and the function you’re calling from must be async. Eventually up the call stack you’ll get to a call that adds the async work to a task queue, executor, or blocks waiting for it to complete. These are all examples of effect handlers for async programming. They provide the scheduling effects that the async code needs in order to run.
“每当我们问当地人，这里安全吗？他们都会安慰我们，这里一切正常。”茜茜向界面新闻表示，哈利法塔附近依旧人声鼎沸，在她滞留的几天里，常常感受到一种奇异的割裂感。
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Российское посольство заявило о спекуляции молдавских СМИ20:43
«Мы запустили рой ударных беспилотников по государственной израильской оборонной и аэрокосмической компании в ответ на преступную израильскую агрессию, жертвами которой стали десятки ливанских городов», — заявили представители движения.
Growing up, did any of your friends' parents have an intercom system in their houses? Now, you don't have to be wealthy or live in a sprawling estate to install an intercom in your home.