Making Result<(), Box<dyn std::error::Error>> thread-safe

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I have some async code that I'm trying to further speed up by moving the inner part of a loop into a thread. However, the async block contains a lot of expressions using the ? operator, and the compiler is giving me error E0282 saying type annotations are needed for the return type of the block, and I can't use Result<(), Box<dyn std::error::Error>> because dyn std::error::Error is not Send. Is there a quick and easy way to get around this, especially since I don't intend to use the return values from this async block, or do I have to handle error conditions every place I use the question mark operator?

Please let me know if this is too vague to provide an accurate answer and I'll be happy to give more information or example code.

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Use Box<dyn std::error::Error + Send>

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The one you want is Box<dyn std::error::Error + Send + Sync>.

Only adding Send causes various types of trouble.

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