[ISSUE #10648]📝Run the send_message_constants module example as a doctest

[WaterWhisperer]

Which Issue(s) This PR Fixes(Closes)

• Fixes [Doc📝] Run the send_message_constants module example as a doctest #10648

Brief Description

How Did You Test This Change?

Summary by CodeRabbit

• Documentation
  • Updated a Rust documentation example for improved clarity and standard formatting.
  • No functional behavior changes.

[rocketmq-rust-bot]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: bb7004f2-2347-4ce7-bacb-a0866bf6ff73

📥 Commits

Reviewing files that changed from the base of the PR and between 28c7a3b and 0524c32.

📒 Files selected for processing (1)

• rocketmq-broker/src/send_message_constants.rs

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Walkthrough

The module-level usage example changes from an ignored Rust code block to a runnable Rust code block. The change adds spacing after the use statement and does not alter runtime code.

Changes

Documentation example

Layer / File(s)	Summary
Enable doctest execution rocketmq-broker/src/send_message_constants.rs	The example changes from rust,ignore to rust and adds a blank line after the use statement. The supplied change summary does not report a declaration for topic.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other · Severity of issue fixed: Low

Suggested reviewers: mxsm

Merge Risk: ⚪ Minimal · up to 0524c

The runnable example change has no identified production impact and is ready to merge after normal checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Linked Issues check	❓ Inconclusive	The diff for #10648 implements the requested example change. It removes ignore, declares let topic = String::from("TopicTest");, and preserves the message_limits::MAX_TOPIC_LENGTH check. The ava…	Provide the formatting and doctest command results. Confirm that the doctest run executes one additional passing doctest.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: running the send_message_constants module example as a doctest. The issue reference and emoji add minor noise but do not reduce clarity.
Out of Scope Changes check	✅ Passed	The whole-PR diff contains only the module documentation example in rocketmq-broker/src/send_message_constants.rs. The change directly implements issue #10648 and does not show unrelated source or t…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…

Full details: Linked Issues check

Explanation

The diff for #10648 implements the requested example change. It removes ignore, declares let topic = String::from("TopicTest");, and preserves the message_limits::MAX_TOPIC_LENGTH check. The available evidence does not show results for cargo fmt -p rocketmq-broker -- --check or cargo test -p rocketmq-broker --doc, including the required increase of one passing doctest.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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_{A rabbit found a code block bright
It hopped from ignored into sight
With one blank line neat
The docs look complete
And waits for tests to check it right}

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