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Error handling · easy

15. Result<T, E>

Recoverable errors as values.

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`Result` is `Ok(T)` or `Err(E)`. The `?` operator returns early on Err, converting the error via the From trait. Because results are values, error paths are visible in signatures rather than hidden in exceptions.

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  1. 1. What does `?` do on an Err?

  2. 2. Which trait powers `?` error conversion?

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