Pass the error message format to rustdoc

[poliorcetics]

• Goes with Make rustdoc respect --error-format short in doctests rust#81675.
• Will help with Rustdoc does not obey --error-format for doctests error messages rust#81662.

This is my first PR to Cargo and I haven't finished reading the contributor guide yet, how should I add tests for this ? Did I had the code in the correct place ?

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[ehuss]

Thanks for the PR! Yea, I think a small test would be good. I would probably stick it in message_format.rs.

It's a little tricky to be careful when matching the output from rustc/rustdoc. Checking the output too precisely makes the tests fail whenever the text in the diagnostic changes (which is relatively often), so if you can check the output without being too exact, that would be nice (use [..] when checking the output).

Since this only works on nightly, you'll also need to a check at the top of the test that looks something like this:

    if !is_nightly() {
        // --error-format=short support added in 1.51
        return;
    }

Let me know if you have any other questions.

[poliorcetics]

@rustbot label -S-waiting-on-author +S-waiting-on-review

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[ehuss]

Thanks!

@bors r+

[bors]

📌 Commit 83b353b has been approved by ehuss

[bors]

⌛ Testing commit 83b353b with merge 572e201...

[bors]

☀️ Test successful - checks-actions
Approved by: ehuss
Pushing 572e201 to master...