Walkthrough

This PR adds manual garbage collection traversal support by implementing the Traverse trait for async generators, coroutines, generators, and the core Coro struct, while marking their pyclass definitions with traverse = "manual" to enable explicit GC tracing of contained fields.

Changes

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• sys.set_asyncgen_hook #6439 — Modifies the same async generator types (PyAsyncGen, PyAnextAwaitable, PyAsyncGenASend/AThrow/WrappedValue) with lifecycle methods and state management
• PyAnextAwaitable  #6427 — Introduces or modifies PyAnextAwaitable and async generator types alongside GC traversal additions

Poem

🐰 A rabbit hops through memory lanes,
Tracing coroutines' flowing chains,
Generators yield their GC care,
Traverse marks what's hiding there!
Cleanup bound, no leaks remain ✨

• 📝 Generate docstrings

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Code has been automatically formatted

The code in this PR has been formatted using:

• cargo fmt --all
  Please pull the latest changes before pushing again:

git pull origin traverse