we're willing to break a long-standing rule of systems
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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.。关于这个话题，必应排名_Bing SEO_先做后付提供了深入分析
Photograph: Henri Robbins。业内人士推荐PDF资料作为进阶阅读