cut: strip i/o errno

[Devel08]

closes #14051

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/resolution (fails in this run but passes in the 'main' branch)
Note: The gnu test tests/rm/many-dir-entries-vs-OOM is now being skipped but was previously passing.
Congrats! The gnu test tests/cut/cut-huge-range is now passing!
Congrats! The gnu test tests/tail/tail-n0f is now passing!
Skip an intermittent issue tests/pr/bounded-memory (was skipped on 'main', now failing)

[Devel08]

really interesting why cargo tests cannot reproduce that

$ cargo run cut -c1 /proc/self/mem
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
     Running `target/debug/coreutils cut -c1 /proc/self/mem`
cut: Input/output error

[codspeed-hq]

Merging this PR will not alter performance

✅ 357 untouched benchmarks
⏩ 50 skipped benchmarks¹

---

_{Comparing Devel08:fix-issue-14051 (a360b5e) with main (df30282)}

Footnotes

1. 50 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[Devel08]

@cakebaker what cargo test returns is different than when the same command it uses is ran manually, what can be the cause?

[Devel08]

turns out we had to strip errno for both chars and bytes :D

[oech3]

Use stderr_is instead.

[Devel08]

Thanks

[oech3]

Can be different PR. But result.map_err(|_| ...)?;

[Devel08]

Yeah, I thought of the same, but let's simplify it later as I've seen it in other places too?

[oech3]

yes