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Code Issues Releases Activity

Error is not yet available in core on stable (#1005)

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Dominik Maier 2023-07-18 11:02:24 +02:00 committed by GitHub
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src/error-handling/converting-error-types-example.md
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@ -52,8 +52,9 @@ Key points:
* The `username` variable can be either `Ok(string)` or `Err(error)`.
* Use the `fs::write` call to test out the different scenarios: no file, empty file, file with username.
It is good practice for all error types to implement `std::error::Error`, which requires `Debug` and
`Display`. It's generally helpful for them to implement `Clone` and `Eq` too where possible, to make
It is good practice for all error types that don't need to be `no_std` to implement `std::error::Error`, which requires `Debug` and `Display`. The `Error` crate for `core` is only available in [nightly](https://github.com/rust-lang/rust/issues/103765), so not fully `no_std` compatible yet.
It's generally helpful for them to implement `Clone` and `Eq` too where possible, to make
life easier for tests and consumers of your library. In this case we can't easily do so, because
`io::Error` doesn't implement them.