Move typeid into vtable by coolreader18 · Pull Request #6231 · RustPython/RustPython

coolreader18 · 2025-10-31T18:23:07Z

Now that TypeId::of() is const, we can move the typeid into PyObjVTable

Summary by CodeRabbit

Chores
- Updated minimum Rust toolchain requirement to 1.91.0. Users compiling from source must upgrade their Rust toolchain.
Refactor
- Internal type-identification implementation switched from callable lookups to associated constants. No user-visible behavior changes, only internal API shape.

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coderabbitai · 2025-10-31T18:23:21Z

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Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Workspace Rust toolchain minimum bumped from "1.89.0" to "1.91.0" in Cargo.toml. Several implementations of ::rustpython_vm::PyPayload replace the payload_type_id() function with an associated constant PAYLOAD_TYPE_ID (using core::any::TypeId) in generated and builtin types.

Changes

Cohort / File(s)	Summary
Toolchain Version Bump `Cargo.toml`	Updated `workspace.package.rust-version` from `"1.89.0"` to `"1.91.0"`.
Derived PyPayload impls `crates/derive-impl/src/pyclass.rs`, `crates/derive-impl/src/pystructseq.rs`	Replaced `fn payload_type_id() -> ::std::any::TypeId` with an associated `const PAYLOAD_TYPE_ID: ::core::any::TypeId`; constants initialized from base type `PAYLOAD_TYPE_ID`.
Builtin payload const `crates/vm/src/builtins/str.rs`	Removed `payload_type_id()` and added public `PAYLOAD_TYPE_ID: core::any::TypeId = core::any::TypeId::of::<PyStr>();`.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

Wtf8-compatible fixes #5985: Changes the PyPayload API by replacing payload_type_id() with an associated constant PAYLOAD_TYPE_ID, which directly relates to the trait-implementation updates here.

Poem

🐰
I nibbled code beneath a moonlit patch,
Replaced a function with a constant hatch,
From std to core the TypeId springs,
Toolchain hops up—new tiny things!

Pre-merge checks

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title 'Move typeid into vtable' does not match the changeset, which only updates the Rust toolchain version from 1.89.0 to 1.91.0 in Cargo.toml.	Update the PR title to accurately reflect the actual change, such as 'Bump Rust toolchain requirement to 1.91.0' or 'Update workspace rust-version to 1.91.0'.
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%.	You can run `@coderabbitai generate docstrings` to improve docstring coverage.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

📜 Recent review details

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between cdb78f6 and 1756a5c.

📒 Files selected for processing (4)

Cargo.toml
crates/derive-impl/src/pyclass.rs
crates/derive-impl/src/pystructseq.rs
crates/vm/src/builtins/str.rs

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coderabbitai

Actionable comments posted: 1

📜 Review details

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7249af9 and a8b2f9e.

📒 Files selected for processing (1)

Cargo.toml (1 hunks)

🧰 Additional context used

🧠 Learnings (2)

📚 Learning: 2025-09-11T05:06:59.971Z

Learnt from: CR
Repo: RustPython/RustPython PR: 0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-09-11T05:06:59.971Z
Learning: Applies to Lib/**/*.py : Minimize modifications to CPython standard library files; only make minimal changes to work around RustPython limitations

Applied to files:

Cargo.toml

📚 Learning: 2025-09-11T05:06:59.971Z

Learnt from: CR
Repo: RustPython/RustPython PR: 0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-09-11T05:06:59.971Z
Learning: Applies to {vm,stdlib}/**/*.rs : Use RustPython macros (`pyclass`, `pymodule`, `pyfunction`, etc.) when implementing Python functionality in Rust

Applied to files:

Cargo.toml

Cargo.toml

youknowone

Looks great, the failing CI must not be related, right?

youknowone · 2025-11-01T15:39:36Z

No idea how they are related, but re-running CI doesn't fix it.

youknowone · 2025-12-30T08:45:49Z

const PAYLOAD_TYPE_ID evaluates to different values across compilation units

youknowone

awesome!

* Move typeid into vtable * Bump rust-version

coderabbitai bot reviewed Oct 31, 2025

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youknowone reviewed Nov 1, 2025

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youknowone force-pushed the vtable-typeid branch from a8b2f9e to cdb78f6 Compare December 30, 2025 08:44

youknowone marked this pull request as draft January 4, 2026 15:43

coolreader18 added 2 commits January 6, 2026 11:41

Move typeid into vtable

45e7509

Bump rust-version

1756a5c

coolreader18 force-pushed the vtable-typeid branch from cdb78f6 to 1756a5c Compare January 6, 2026 17:42

youknowone approved these changes Jan 7, 2026

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youknowone marked this pull request as ready for review January 7, 2026 03:32

youknowone approved these changes Jan 7, 2026

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youknowone merged commit 09bde28 into RustPython:main Jan 7, 2026
32 of 35 checks passed

coolreader18 deleted the vtable-typeid branch January 7, 2026 23:03

terryluan12 pushed a commit to terryluan12/RustPython that referenced this pull request Jan 15, 2026

Move typeid into vtable (RustPython#6231)

da30dba

* Move typeid into vtable * Bump rust-version

coolreader18 mentioned this pull request Jan 23, 2026

Make validate_downcastable_from unsafe #6851

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Move typeid into vtable#6231

Move typeid into vtable#6231
youknowone merged 2 commits intoRustPython:mainfrom
coolreader18:vtable-typeid

coolreader18 commented Oct 31, 2025 •

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coolreader18 commented Oct 31, 2025 •

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