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Is this going to be on its own feature flag (which I think will require its own tracking issue)? Although it's a minor change, I would expect it's too late to include it in fmt_from_fn as that would need to be backported into the currrent beta (1.93).

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

@rustbot label +I-libs-api-nominated +needs-fcp

Nominating for @rust-lang/libs-api since this is insta-stable as written. I don't think there would be much benefit to going through a const-unstable period here.

@rfcbot fcp merge libs-api

Team member @dtolnay has proposed to merge this. The next step is review by the rest of the tagged team members:

• @Amanieu
• @BurntSushi
• @dtolnay
• @joshtriplett
• @the8472

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

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