[swift-users] Is there any harm that an @escaping handler never called?

[Zhao Xin]

For example, I have an async query, I pass it an `@escaping resultHandler`.
If there is any results, the handler will run. However, if the result is
empty, the `@escaping resultHandler` will never run.

Is there any memory leak or something will happen if the `@escaping
resultHandler` never runs?

Zhao Xin
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