mention that a comma might be expected

[brmataptos]

Description

In case of a missing comma, mention that as part of an error message.

Fixes #13632.

How Has This Been Tested?

Added a test case based on the issue. See an existing test case also is updated.

Key Areas to Review

Is it really clearer?

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Full Node (API, Indexer, etc.)
• Move/Aptos Virtual Machine
• Aptos Framework
• Aptos CLI/SDK
• Developer Infrastructure
• Other (specify)

Checklist

• I have read and followed the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I identified and added all stakeholders and component owners affected by this change as reviewers
• I tested both happy and unhappy path of the functionality
• I have made corresponding changes to the documentation

[trunk-io]

⏱️ 1h 2m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
rust-targeted-unit-tests	22m	🟩
rust-move-unit-coverage	12m	🟩
rust-move-tests	12m	🟩
rust-lints	6m	🟩
run-tests-main-branch	4m	🟩
check-dynamic-deps	2m	🟩 🟩
general-lints	2m	🟩
semgrep/ci	20s	🟩
file_change_determinator	11s	🟩
file_change_determinator	9s	🟩
permission-check	4s	🟩
permission-check	3s	🟩
permission-check	2s	🟩
permission-check	1s	🟩

_{settings ⋅ feedback ⋅ docs ⋅ learn more about trunk.io}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.0%. Comparing base (1feb429) to head (5233817).
Report is 898 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13650   +/-   ##
=======================================
  Coverage    58.9%    59.0%           
=======================================
  Files         824      824           
  Lines      198320   198327    +7     
=======================================
+ Hits       117008   117015    +7     
  Misses      81312    81312           

☔ View full report in Codecov by Sentry.
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[gregnazario]

This one is a bit weird, because it's just that phatom is not a keyword

[brmataptos]

Error messages are hard, as you see.

[brmataptos]

But it's not really terrible, and this is a small improvement in almost all cases, so maybe just approve?

[github-actions]

This issue is stale because it has been open 45 days with no activity. Remove the stale label, comment or push a commit - otherwise this will be closed in 15 days.

[vineethk]

Just leaving a test top level comment.

[github-actions]

This issue is stale because it has been open 45 days with no activity. Remove the stale label, comment or push a commit - otherwise this will be closed in 15 days.

[github-actions]

This issue is stale because it has been open 45 days with no activity. Remove the stale label, comment or push a commit - otherwise this will be closed in 15 days.