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56087074c6
This stabilizes the `Path::try_exists()` method which returns `Result<bool, io::Error>` instead of `bool` allowing handling of errors unrelated to the file not existing. (e.g permission errors) Along with the stabilization it also: * Warns that the `exists()` method is error-prone and suggests to use the newly stabilized one. * Suggests it instead of `metadata()` to handle errors. * Mentions TOCTOU bugs to avoid false assumption that `try_exists()` is completely safe fixed version of `exists()`. * Renames the feature of still-unstable `std::fs::try_exists()` to `fs_try_exists` to avoid name conflict. The tracking issue #83186 remains open to track `fs_try_exists`.