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Add that the ? operator works with From<Err> (#1059)

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sakex 2023-08-09 16:48:15 +02:00 committed by GitHub
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src/error-handling/try-operator.md
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@ -51,8 +51,8 @@ Key points:
* Use the `fs::write` call to test out the different scenarios: no file, empty file, file with username. * Use the `fs::write` call to test out the different scenarios: no file, empty file, file with username.
* The return type of the function has to be compatible with the nested functions it calls. For instance, * The return type of the function has to be compatible with the nested functions it calls. For instance,
a function returning a `Result<T, Err>` can only apply the `?` operator on a function returning a a function returning a `Result<T, Err>` can only apply the `?` operator on a function returning a
`Result<AnyT, Err>`. It cannot apply the `?` operator on a function returning a `Result<T, OtherErr>` `Result<AnyT, Err>`. It cannot apply the `?` operator on a function returning an `Option<AnyT>` or `Result<T, OtherErr>`
or an `Option<AnyT>`. Reciprocally, a function returning an `Option<T>` can only apply the `?` operator unless `OtherErr` implements `From<Err>`. Reciprocally, a function returning an `Option<T>` can only apply the `?` operator
on a function returning an `Option<AnyT>`. on a function returning an `Option<AnyT>`.
* You can convert incompatible types into one another with the different `Option` and `Result` methods * You can convert incompatible types into one another with the different `Option` and `Result` methods
such as `Option::ok_or`, `Result::ok`, `Result::err`. such as `Option::ok_or`, `Result::ok`, `Result::err`.