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io::ErrorKind: Discuss matching #90706

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io::ErrorKind: Discuss matching #90706

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9 changes: 9 additions & 0 deletions library/std/src/io/error.rs
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Expand Up @@ -88,6 +88,15 @@ struct Custom {
/// It is used with the [`io::Error`] type.
///
/// [`io::Error`]: Error
///
/// # Handling errors and matching on `ErrorKind`
///
/// In application code, use `match` for the `ErrorKind` values you are expecting; use `_` to match
/// "all other errors".
///
/// In comprehensive and thorough tests, you may need to cut-and-paste the current list of
/// errors from here into your test code. This seems counterintuitive, but is correct,
/// as set out in [this blog post](https://diziet.dreamwidth.org/9894.html#diziet-what-to-do).
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
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