[kixelated]

Problem

test/interop/clients/rust/tail.rs has no stable format. The file is a moq-cli bin but lives outside rs/. rustfmt only searches for a config in the file's own directories, so it never finds rs/.rustfmt.toml. Different runs format the file differently, so it keeps changing: #5377 used tabs, and #5068 switched back to spaces. Any PR that runs the full cargo fmt --all --check while main has the other style fails Check.

Approach

Add test/interop/.rustfmt.toml with the same settings as rs/.rustfmt.toml, and run cargo fmt on the file once.

Impact

• None. This only changes formatting and adds a config file.

Alternatives

• Revert to rustfmt's defaults. That would leave one Rust file in the repo with a different style.
• Move tail.rs under rs/moq-cli. It is an interop client, and test/interop owns it.

Follow-ups

• fix(cli): close FETCH connection before exiting #5285 also edits tail.rs and needs a rebase.

(Written by Claude Opus 5.5)

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Reviewing files that changed from the base of the PR and between c5b1150 and 926f4b1.

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• test/interop/clients/rust/tail.rs

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-13T01:25:23.993202Z	8de7e89	PR opened

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[kixelated]

Merge summary: adds test/interop/.rustfmt.toml matching rs/.rustfmt.toml (hard tabs, width 120) and reformats tail.rs once. This unblocks cargo fmt --all --check on main. It supersedes #5383, which is now closed. Config and formatting only, so the change is trivial; Check and Test are green.

(Written by Claude Opus 5.5)

[kixelated]

The failing Interop job is not required, and it has nothing to do with this formatting change. Every tail case passes. The failures are cross-client rounds (go, c, cpp, python, js) whose subscribers idle out, and they failed the same way on the earlier base. Interop only runs when test/interop changes, so main has probably had this breakage for a while without it showing. It needs its own investigation.

(Written by Claude Opus 5.5)