[derive] Fix unused variable bug in tests

[joshlf]

---

• 　 [derive] Introduce Ctx type #2890
• 　 [derive] Move find_zero_variant to enum module #2889
• 　 [derive] Split repr(C) logic from derive_known_layout_inner #2888
• 👉 [derive] Fix unused variable bug in tests #2891

[gemini-code-assist]

Summary of Changes

Hello @joshlf, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a minor bug within the test suite for the zerocopy-derive crate. It specifically fixes an issue where a variable intended for use in a test output message was being ignored, and a static string was used instead, leading to an unused variable warning or incorrect test output. This ensures test output accurately reflects the intended differences.

Highlights

• Test Bug Fix: Resolved an unused variable compiler warning/error in zerocopy-derive/src/output_tests.rs by correctly using the diff variable instead of a hardcoded string literal in a println! macro.

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[gemini-code-assist]

Code Review

This pull request addresses a bug in the assert_eq_streams test helper function. Previously, the calculated diff was not being used in the panic message, which instead printed the literal string "diff". This change corrects the panic! macro invocation to use the diff variable, ensuring that test failures will now display the actual difference between expected and actual token streams. This is a good fix that improves the utility of the test assertions. The change is correct and well-targeted.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.90%. Comparing base (ef4020b) to head (8aa9ec6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2891   +/-   ##
=======================================
  Coverage   91.90%   91.90%           
=======================================
  Files          20       20           
  Lines        5878     5878           
=======================================
  Hits         5402     5402           
  Misses        476      476           

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