feat: project borrowed sum payloads in place - #857
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sanohiro
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August 19, 2026 05:16
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Summary
Option,Result, and user-defined sum places as checked HIR/MIR projections.Why
This enables safe borrowed sum-payload access without creating initialized storage for a projection-only binding. The admissible payload grammar remains finite and fail-closed; unsupported owned payloads keep the existing diagnostic path.
Validation
scripts/cargo.sh test -p align_driver --test borrowed_params -- --nocapture(21 passed)scripts/cargo.sh test -p align_sema borrowed_sum_match -- --nocapture(2 passed)scripts/cargo.sh test -p align_mir validate_hir_tests::hir_body_validator_accepts_nested_tagged_payload_construction -- --nocapturescripts/lint-ratchet.shscripts/pre-pr.sh --reviewer codex --findings-fixed ...(owner test, bounded gate, and Clippy passed)The implementation follows
docs/impl/26-borrowed-sum-projection-plan.md.