Tracking Issue for io_error_input_output_error

Feature gate: #![feature(io_error_input_output_error)]

This is a tracking issue for the InputOutputError variant of std::io::ErrorKind, returned for a low-level I/O error. It maps to EIO on Unix and to ERROR_IO_DEVICE on Windows.

Motivation and prior art (PTY EOF handling, storage/VM backends, buck2's own tag for this errno) are in the ACP, linked below.

Public API

// std::io

pub enum ErrorKind {
    // ...
    InputOutputError,
}

Steps / History

• ACP: rust-lang/libs-team#824
• Implementation #159070
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• The variant name. InputOutputError is what's implemented for now, following the ACP. It isn't settled: DeviceError was proposed, but EIO isn't limited to devices (cuviper). Naming only blocks stabilization, not this issue, so further suggestions are welcome here.

Start with the std::io::ErrorKind public API and read the linked ACP, rust-lang/libs-team#824, plus the feature-lifecycle stabilization guidance. The implementation is identified as #159070; done requires resolving the variant name, completing the final comment period, and preparing a stabilization PR.