Walkthrough

The changes update the set implementation and its tests. The Rust code for set difference updates now collects items to remove before deleting them, preventing iteration errors. The Python test removes an expected failure decorator from a test that checks in-place set operations, aligning behavior with CPython.

Changes

Sequence Diagram(s)

sequenceDiagram
    participant Test as test_inplace_on_self
    participant PySet as PySetInner
    participant VM as VirtualMachine

    Test->>PySet: t = self.s.copy()
    Test->>PySet: t |= t (inplace or)
    Test->>PySet: t &= t (inplace and)
    PySet->>PySet: intersection_update
    Test->>PySet: t -= t (inplace difference)
    PySet->>PySet: difference_update (collect items, then delete)
    Test->>PySet: t ^= t (inplace xor)
    PySet->>PySet: symmetric_difference_update

Assessment against linked issues

Poem

In the garden of sets where the rabbits play,
Bugs in &= and -= have hopped away!
No more errors as we prune and we tend,
Now in-place updates behave and blend.
With every test passing, we leap with delight—
Rust and Python, together just right!
🐇✨

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Reviewing files that changed from the base of the PR and between 8cac433 and 739bc8d.

• Lib/test/test_set.py (0 hunks)
• vm/src/builtins/set.rs (1 hunks)

• Lib/test/test_set.py

Learnt from: CR
PR: RustPython/RustPython#0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-06-26T12:52:11.138Z
Learning: Minimize modifications to CPython standard library files in the Lib/ directory; bug fixes should be made through Rust code modifications whenever possible.

• GitHub Check: Run snippets and cpython tests (ubuntu-latest)
• GitHub Check: Run snippets and cpython tests (windows-latest)
• GitHub Check: Check the WASM package and demo
• GitHub Check: Run rust tests (ubuntu-latest)
• GitHub Check: Check Rust code with rustfmt and clippy
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• GitHub Check: Run tests under miri
• GitHub Check: Run rust tests (windows-latest)
• GitHub Check: Run snippets and cpython tests on wasm-wasi
• GitHub Check: Run rust tests (macos-latest)
• GitHub Check: Ensure compilation on various targets

vm/src/builtins/set.rs (1)

428-430: Excellent fix for the "set changed size during iteration" issue.

The change correctly separates iteration from modification by collecting all items first using collect::<Result<Vec<_>, _>>() before performing deletions. This prevents the runtime error that occurs when a set's size changes during iteration.

The approach is sound because:

• Errors during iteration are handled before any set modifications occur
• The semantic behavior remains identical
• It's consistent with symmetric_difference_update which already uses a similar pattern

• 📝 Generate Docstrings

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For some reason the spellchecker uses git diff-tree instead of git2 which seems very sketch to me.