Fix issue with for loop expansion

[ghost]

Fixes #27639

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @sfackler (or someone else) soon.

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[alexcrichton]

Thanks! Could you also squash the commits together? Other than that though r=me

[ghost]

Squashed!

[bluss]

@bors r=alexcrichton

[bors]

📌 Commit ae68e90 has been approved by alexcrichton

[bors]

⌛ Testing commit ae68e90 with merge 2945555...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt