Language Tooling: AST Diff & Refactoring Safety Checker

Seed: old_ast, new_ast, refactor_rules; sample: check refactor preserves semantics by unit test snapshots

Implementation Guide

Build an AST-level diff tool that verifies mechanical refactorings preserve semantics by checking equivalence on representative test suites and by analyzing control/data-flow invariants. Use it in large-scale automated refactor PRs to speed safe codebase transformations and reduce review burden.

💡 Expert Q&A Insights

Q: \

Can AST diffs prove semantic equivalence?\" \"

Q: Not generally; they help detect obvious divergences but require test-suite validation and formal methods for guarantees.\"\n\"

How to pick representative tests?\" \"

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