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clarify description of when ? can be used #2471

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Oct 5, 2020
Merged

clarify description of when ? can be used #2471

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2 changes: 1 addition & 1 deletion src/ch09-02-recoverable-errors-with-result.md
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Expand Up @@ -389,7 +389,7 @@ The `?` operator can be used in functions that have a return type of
`Result`, because it is defined to work in the same way as the `match`
expression we defined in Listing 9-6. The part of the `match` that requires a
return type of `Result` is `return Err(e)`, so the return type of the function
can be a `Result` to be compatible with this `return`.
has to be a `Result` to be compatible with this `return`.

Let’s look at what happens if we use the `?` operator in the `main` function,
which you’ll recall has a return type of `()`:
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