PyTraceback Constructor by youknowone · Pull Request #5958 · RustPython/RustPython

youknowone

Walkthrough

The changes update the PyTraceback class in the traceback module to implement the Constructor trait. This includes modifying the class attribute, importing necessary types, and adding a new implementation that validates arguments and provides a custom constructor method for creating traceback objects.

Changes

File(s)	Change Summary
vm/src/builtins/traceback.rs	Updated imports; modified `PyTraceback` to use `#[pyclass(with(Constructor))]`; implemented `Constructor` trait for `PyTraceback` with argument validation and a `py_new` method.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant VirtualMachine
    participant PyTraceback

    Caller->>VirtualMachine: Request creation of PyTraceback with args
    VirtualMachine->>PyTraceback: Call Constructor::py_new(cls, args, vm)
    PyTraceback->>PyTraceback: Validate lineno argument
    alt lineno invalid
        PyTraceback-->>VirtualMachine: Return ValueError
    else lineno valid
        PyTraceback->>VirtualMachine: Return new PyTraceback instance
    end
    VirtualMachine->>Caller: Return result (PyTraceback or error)

Poem

In the warren of code, a new path appears,
Tracebacks now built with constructor cheers.
Arguments checked, line numbers precise,
Errors caught early—oh, isn’t that nice?
With each little hop, the stack traces grow,
A rabbit’s delight in the traceback flow! 🐇

📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 52d4632 and 4f36253.

⛔ Files ignored due to path filters (1)

Lib/test/test_raise.py is excluded by !Lib/**

📒 Files selected for processing (1)

vm/src/builtins/traceback.rs (3 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

**/*.rs

Instructions used from:

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.github/copilot-instructions.md

🧠 Learnings (1)

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

Learnt from: CR
PR: RustPython/RustPython#0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-06-30T10:08:48.858Z
Learning: Applies to **/*.rs : Use the macro system (`pyclass`, `pymodule`, `pyfunction`, etc.) when implementing Python functionality in Rust

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (11)

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

🔇 Additional comments (3)

vm/src/builtins/traceback.rs (3)

3-6: LGTM! Import statements are correctly updated.

The added imports (PyTypeRef, PyResult, VirtualMachine, Constructor) are all necessary for implementing the Constructor trait and are imported from the appropriate modules.

29-29: LGTM! Correct use of the macro system.

The #[pyclass(with(Constructor))] attribute correctly tells the macro system that this class implements the Constructor trait, following RustPython patterns for exposing constructors to Python.

71-81: Unable to run Clippy in sandbox – please verify locally

The automated cargo clippy check failed due to environment limitations (no /proc/self/exe available). To ensure no new warnings have been introduced by this change, please run the following on your machine:
cd into the vm directory
Execute:
cargo clippy --all-targets --all-features -- -D warnings

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