Code nits in `contextvars.rs` by ShaharNaveh · Pull Request #7835 · RustPython/RustPython

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Reviewing files that changed from the base of the PR and between 320355f and 4a1f655.

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crates/stdlib/src/contextvars.rs

📝 Walkthrough

Walkthrough

This PR refactors error handling and conditional logic across context variable implementations in contextvars.rs. Error messages are now constructed inline within vm.new_*_error(...) calls using format!, and conditional branching is simplified using idiomatic Rust patterns like ok_or_else and inline if expressions. No public signatures or exported entities change.

Changes

Context Variables Refactor

Layer / File(s)	Summary
Context Enter/Exit Error Handling `crates/stdlib/src/contextvars.rs`	`Context::enter` and `Context::exit` inline error message construction via `format!` and `ok_or_else` closures, removing temporary `msg` variables.
Context Get Value Resolution `crates/stdlib/src/contextvars.rs`	`PyContext::get` consolidates found-vs-default branching into a single `Ok(if found.is_some() {...})` expression.
PyContext Mapping Subscript `crates/stdlib/src/contextvars.rs`	`AsMapping::subscript` for `PyContext` chains `get_inner(...).ok_or_else(...)` directly, removing the intermediate `found` variable.
ContextVar Delete/Get Error Handling `crates/stdlib/src/contextvars.rs`	`ContextVar::delete` and `ContextVar::get` remove intermediate `msg` variables and pass formatted strings directly into `vm.new_lookup_error(...)`.
ContextToken Reset Error Handling `crates/stdlib/src/contextvars.rs`	`ContextToken::reset` inlines error message construction for "already used" and "created by different var/context" errors, removing local `msg` construction pattern.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 The context flows cleaner now, I say,
With errors formatted inline today,
No temporary messengers lingering around,
Just elegant patterns where brevity's found!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ 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 'Code nits in `contextvars.rs`' accurately describes the changeset, which consists of minor refactoring improvements (nits) to error handling and conditional logic in the contextvars.rs module.
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.

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