fix: explain zig version requirement on build failure

[Pimpmuckl]

When just build fails with an incompatible Zig installation, the final error now states that Herdr requires Zig 0.16.0 and suggests checking zig version or setting ZIG to the correct binary. This only extends the existing failure message (one file, +3/-1); it also appears for other Zig build failures.

Validation: just build passes on Windows with Zig 0.16.0; cargo fmt --check and git diff --check pass. A directly compiled build script with a deliberately failing compiler invocation confirms the hint is printed. Full just check is unnecessary for this message-only change; no build logic changes.

[coderabbitai]

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Run ID: d6db47de-42a6-40d5-a3d7-050cabf8dcd4

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Reviewing files that changed from the base of the PR and between 6e7d415 and 472d491.

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• build.rs

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📝 Walkthrough

Walkthrough

The zig build failure assertion now states that Zig 0.16.0 is required. It also directs developers to check zig version or set ZIG to a compatible binary.

Suggested reviewers: ogulcancelik

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 472d4

This documentation-only build guidance change has no remaining merge-blocking risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: explaining the Zig version requirement when the build fails.
Description check	✅ Passed	The description directly explains the updated Zig build failure message, its scope, and validation results.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[kangal-bot]

@coderabbitai review
@greptileai

[coderabbitai]

@kangal-bot I will review the changes in #3931.

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge because it only adds accurate guidance while preserving the underlying Zig build diagnostics.

Summary

• Identifies Zig 0.16.0 as the required toolchain.
• Suggests checking zig version or configuring ZIG.
• Does not alter build execution or error propagation.

_{Reviews (1) · Last reviewed commit: "fix: explain zig version requirement on ..."}