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Oh yeah, that's likely it. Thanks!

It it safe to just put a noop in there? What's From-ness? Is QuestionError defined in std? Where do I read more?

EDIT: oh I see, I didn't read carefully. I just need to provide a conversion. Your example is very clear.

It's how you explicitly cast from one type to another. To use the ? operator with a custom error type, it needs to be converted to the std error type.

It needs to be converted to whatever error type the function returns. That can be anything.

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