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Rollup merge of #106964 - workingjubilee:crouching-ioerror-hidden-documentation, r=ChrisDenton

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Clarify `Error::last_os_error` can be weird

Fundamentally, querying the OS for error codes is a process that is deeply subject to the whims of chance and fortune. We can account for OS, but not for every combination of platform APIs. A compiled binary may not recognize new errors introduced years later. We should clarify a few especially odd situations, and what they mean: We can effectively promise nothing... if you ask for Rust to decode errors where none have occurred.

This allows removing mention of ErrorKind::Uncategorized.
That error variant is hidden deliberately, so we should not explicitly mention it.

This fixes #106937.

Since you had an opinion also: Does this solution seem acceptable?
r? ``@ChrisDenton``
This commit is contained in:
Matthias Krüger 2023-03-23 19:55:42 +01:00 committed by GitHub
commit aeabe34d79
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1 changed files with 10 additions and 2 deletions
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library/std/src/io/error.rs
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@ -370,7 +370,7 @@ pub enum ErrorKind {
// "Unusual" error kinds which do not correspond simply to (sets // "Unusual" error kinds which do not correspond simply to (sets
// of) OS error codes, should be added just above this comment. // of) OS error codes, should be added just above this comment.
// `Other` and `Uncategorised` should remain at the end: // `Other` and `Uncategorized` should remain at the end:
// //
/// A custom error that does not fall under any other I/O error kind. /// A custom error that does not fall under any other I/O error kind.
/// ///
@ -882,6 +882,13 @@ impl Error {
/// Returns the corresponding [`ErrorKind`] for this error. /// Returns the corresponding [`ErrorKind`] for this error.
/// ///
/// This may be a value set by Rust code constructing custom `io::Error`s,
/// or if this `io::Error` was sourced from the operating system,
/// it will be a value inferred from the system's error encoding.
/// See [`last_os_error`] for more details.
///
/// [`last_os_error`]: Error::last_os_error
///
/// # Examples /// # Examples
/// ///
/// ``` /// ```
@ -892,7 +899,8 @@ impl Error {
/// } /// }
/// ///
/// fn main() { /// fn main() {
/// // Will print "Uncategorized". /// // As no error has (visibly) occurred, this may print anything!
/// // It likely prints a placeholder for unidentified (non-)errors.
/// print_error(Error::last_os_error()); /// print_error(Error::last_os_error());
/// // Will print "AddrInUse". /// // Will print "AddrInUse".
/// print_error(Error::new(ErrorKind::AddrInUse, "oh no!")); /// print_error(Error::new(ErrorKind::AddrInUse, "oh no!"));