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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``