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Use std::fmt::from_fn by coolreader18 · Pull Request #6850 · RustPython/RustPython · GitHub

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Use std::fmt::from_fn - #6850

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youknowone merged 4 commits into
RustPython:mainfrom
coolreader18:fmt-from-fn
Jan 24, 2026
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Use std::fmt::from_fn#6850
youknowone merged 4 commits into
RustPython:mainfrom
coolreader18:fmt-from-fn

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coolreader18 commented Jan 23, 2026 •
edited by coderabbitai Bot
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New in 1.93 - replaces our ad-hoc equivalent types.

Summary by CodeRabbit

  • Chores
    • Updated minimum supported Rust version to 1.93.0

✏️ Tip: You can customize this high-level summary in your review settings.

coderabbitai Bot commented Jan 23, 2026 •
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📝 Walkthrough

Walkthrough

Rust version bumped to 1.93.0 in Cargo.toml. Two codebases refactored to use fmt::from_fn instead of custom display wrappers, removing lifetime parameters in method signatures. A new helper function added to resolve hard dependencies in the update library script.

Changes

Cohort / File(s) Summary
Rust Version Bump
Cargo.toml		 Updated workspace.package rust-version from "1.91.0" to "1.93.0"
Display Refactoring
crates/codegen/src/unparse.rs		 Replaced custom to_string_fmt helper with fmt::from_fn-based construction in unparse_formatted and unparse_fstring, removing the standalone helper function while preserving string-accumulation behavior
Trait Method Simplification
crates/compiler-core/src/bytecode/instruction.rs		 Simplified InstructionMetadata::display method signature by removing explicit lifetime parameters and internal wrapper type, now returning impl fmt::Display directly via fmt::from_fn; updated AnyInstruction implementation to match
Dependency Resolution
scripts/update_lib/deps.py		 Added new function resolve_hard_dep_parent(name: str) -> str | None to resolve hard dependency names to their parent module names

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

Suggested reviewers

  • youknowone
  • moreal

Poem

🐰 With fmt::from_fn, we hop along,
Old wrappers gone, our code more strong,
Lifetimes released, and helpers freed,
Rust marches on to version's need,
A cleaner way, a brighter sight! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1 ❌ Failed checks (1 warning)
Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (2 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The pull request title 'Use std::fmt::from_fn' directly reflects the main change: refactoring code to use the standard library's std::fmt::from_fn introduced in Rust 1.93, replacing custom formatting helper types across multiple files.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

✨ Finishing touches
  • 📝 Generate docstrings

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github-actions Bot commented Jan 23, 2026

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Code has been automatically formatted

The code in this PR has been formatted using:

  • cargo fmt --all
  • ruff format
    Please pull the latest changes before pushing again:
git pull origin fmt-from-fn

youknowone merged commit f842fbe into RustPython:main Jan 24, 2026
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