chore: bump toolchain to rust-1.98.0

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• bumps toolchain to Rust 1.98.0 and fixes new clippy lints, result_large_err, chunks_exact_to_as_chunks, unused_imports (not sure why it wasn't caught earlier), useless_format.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• This pull request is based on an issue that a maintainer has accepted (see Before Opening a Pull Request).
• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Maintenance

  • Updated the project’s Rust toolchain to version 1.98.0.
  • Improved internal block-validation error handling during chain synchronization.
  • Streamlined hash processing for more efficient indexing operations.

• Tests

  • Simplified assertions in RPC and checksum tests without changing runtime behavior.
  • Removed an unused test-only import.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 00df0500-b4f0-492f-9a2f-e7bcc4aecd2d

📥 Commits

Reviewing files that changed from the base of the PR and between 1d06155 and 6960197.

📒 Files selected for processing (6)

• rust-toolchain.toml
• src/chain_sync/tipset_syncer.rs
• src/cli/humantoken.rs
• src/db/car/forest/index/hash.rs
• src/rpc/methods/eth/utils.rs
• src/utils/io/writer_checksum.rs

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• filecoin-project/lotus (manual)

💤 Files with no reviewable changes (1)

• src/cli/humantoken.rs

Included review availability: 4 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour.

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Walkthrough

The pull request updates Rust from 1.97.0 to 1.98.0, boxes tipset validation errors, simplifies hash chunk processing, and removes redundant test code.

Changes

Rust compatibility updates

Layer / File(s)	Summary
Boxed tipset validation errors src/chain_sync/tipset_syncer.rs	validate_block returns boxed CID and sync-error tuples. validate_tipset destructures these errors before handling and propagating them.
Hash chunk processing src/db/car/forest/index/hash.rs	summary uses complete eight-byte chunks from as_chunks::<8>() while preserving the existing hash folding behavior.
Toolchain and test updates rust-toolchain.toml, src/cli/humantoken.rs, src/rpc/methods/eth/utils.rs, src/utils/io/writer_checksum.rs	The Rust toolchain advances to 1.98.0. Tests remove an unused import and redundant string formatting.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 69601

This PR updates the Rust toolchain and applies localized lint fixes without introducing an actionable merge-blocking risk; it is merge-ready after normal checks and review.

Possibly related PRs

• ChainSafe/forest#7344: Updates the Rust toolchain from 1.96 to 1.97 in the same configuration file.

Suggested reviewers: akaladarshi, eclesiomelojunior, hanabi1224

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 4 files. (1 skipped: 1 …
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the primary change: updating the Rust toolchain to version 1.98.0. It is concise and specific. The Clippy fixes are secondary changes and do not require inclusion in the t…

Full details: Docstring Coverage

Explanation

Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 4 files. (1 skipped: 1 unsupported.)

Full details: Title check

Explanation

The title clearly identifies the primary change: updating the Rust toolchain to version 1.98.0. It is concise and specific. The Clippy fixes are secondary changes and do not require inclusion in the title.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-rust-1.98

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bump-rust-1.98

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.85%. Comparing base (e3d4268) to head (6960197).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/chain_sync/tipset_syncer.rs	11.11%	3 Missing and 5 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/cli/humantoken.rs	99.35% <ø> (ø)
src/db/car/forest/index/hash.rs	100.00% <100.00%> (ø)
src/rpc/methods/eth/utils.rs	89.64% <100.00%> (ø)
src/utils/io/writer_checksum.rs	82.40% <100.00%> (ø)
src/chain_sync/tipset_syncer.rs	65.00% <11.11%> (-0.21%)	⬇️

... and 6 files with indirect coverage changes

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