rscprof

Hi @ytmimi, I thought about returning pair, but I thought that it changes functions signatures drastically. I will change it tomorrow in your way.

> @rscprof Can you take a look at the failures when you have a chance. Also, the rustfmt team strongly discourages merge commits. When you have a moment can you...

> @rscprof I'm still seeing the [Merge branch 'master' into issue-6013](https://github.com/rust-lang/rustfmt/pull/6024/commits/ba832a92240fbee7fe6b65f7d3272cc6492088b7) commit in the history. Can you please update the git history to remove that merge commit. I made one...

> @rscprof I also want to say thanks for another PR 🙏🏼! I see you've opened several recently. Out of curiosity, are these issues that you're trying to fix because...

> rustfmt doesn't really support formatting macros that use repetition. I'm wondering if it's possible to leverage `MacroArgKind` and return `None` before we even call `replace_names`. I have seen it....

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