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…es at compile/runtime (Aaron 2026-05-01; reserved ID never filed; sibling of B-0141) Aaron 2026-05-01 named "B-0142, not yet filed" in the parallelism- scaling-ladder memo's mechanized-guardrail table — alongside B-0141 (brittle-pointer). Both IDs were reserved; per-row files were never filed. Otto 2026-05-03 audit pass post-B-0141 filing found B-0142 also missing. This is the second concrete hit for B-0177's audit hypothesis. The parallelism-scaling-ladder memo named two B-NNNN IDs; both rows materialized only after Aaron 2026-05-03 surfaced the gap during B-0176 review. Row scope: design-by-contract primitives (requires/ensures/invariant) at function boundaries, mechanizing pre/post-condition + invariant enforcement that's currently review-time-only. Compile-time mode (refinement types) rejects violations at build; runtime mode catches at execution. Composes with Result-over-exception per CLAUDE.md. L-effort due to library/tooling selection (PostSharp, Fody, Roslyn analyzers, F# type providers) + Result-flow composition + migration of existing prose-documented contracts. Composes with: B-0141 (sibling-instance of mechanization), B-0130 (claim-integrity), B-0170 (substrate-claim-checker), B-0177 (audit hypothesis empirical hit #2).
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…— remove throw/panic options from row spec
Real review finding: B-0142 spec mentioned "throws / panics / returns
Result-error" as contract-violation handling options. This conflicts
with CLAUDE.md's hard Result-over-exception invariant ("user-visible
errors surface as Result<_, DbspError> or AppendResult-style values;
exceptions break the referential-transparency the operator algebra
depends on").
Backlog rows act as implementation guidance — admitting throw/panic
in the row spec could cause future contract tooling to reintroduce
exception-based control flow.
Fixes:
- Editorial note added after the verbatim quote (Aaron 2026-05-01
memo's "throws at runtime" wording predates the spec; preserved
verbatim, normalized to Result-flow in the spec)
- Pre-condition primitives: only Result-error flow, no throw/panic
- Open design questions updated: contract-violation handling within
Result-flow (not "throw vs Result-error")
- Carved sentence: explicit Result-over-exception, NO throw/panic
The verbatim Aaron quote stays unchanged per preservation discipline;
the editorial note bridges to Result-flow.
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Pull request overview
This PR adds a new P2 backlog row for B-0142 and updates the generated backlog index so the design-by-contract research item is tracked in the repo’s per-row backlog system. It fits the codebase’s ongoing migration from implicit memo references to explicit docs/backlog/** entries with stable B-IDs.
Changes:
- Adds
docs/backlog/P2/B-0142-...mdto capture the “Code Contracts revival” research/design row with origin, scope, effort, and composition notes. - Regenerates
docs/BACKLOG.mdto include the new B-0142 entry in the P2 section.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
docs/backlog/P2/B-0142-code-contracts-design-by-contract-revival-aaron-2026-05-01.md |
New per-row backlog file describing the design-by-contract / code-contracts research item and its provenance. |
docs/BACKLOG.md |
Regenerated backlog index entry adding B-0142 to the P2 listing. |
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…0170 to match prose Composes-with section
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May 3, 2026
…n + partial pre-existence acknowledged (#1357) Three substantive review findings absorbed: 1. Cross-workflow `needs:` is invalid — `needs:` works only within single workflow file. Architecture corrected to specify three options (Architecture A: reusable workflow via workflow_call; Architecture B: per-workflow detect-job; Architecture C: single consolidated workflow). Architecture A recommended (matches sibling-repo pattern + preserves separation). 2. .yaml → .yml extension throughout — repo's existing workflows consistently use .yml; one-off .yaml suffix would create drift. 3. Problem-statement acknowledged partial pre-existence — gate.yml already skips on docs-only via path-gate; codeql.yml short-circuits pure docs; backlog-only changes have backlog-index-integrity. Row generalizes the partial pattern into uniform mechanism, NOT from-zero gating. The B-0142-stale-cross-references in some threads were merge-ordering false positives (B-0142 not present at PR-eval time; merged later as #1349) — handled in resolve-thread comments.
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…n (4 review threads absorbed) (#1356) * fix(#1349 post-merge): B-0142 migration concerns + scope clarification (4 review threads absorbed) Four substantive post-merge review findings on B-0142: 1. Existing invalidArg/exception-based code in src/Core/** — programmer-error preconditions historically use exceptions in F# idiom; CLAUDE.md Result-over-exception applies to user-visible failures. Scope refinement: B-0142 targets recoverable user-facing failures (Result-flow); programmer-error preconditions stay as invalidArg until a separate decision migrates them. NO blanket-ban exceptions. 2. Plain-returning APIs (bool/Stream/ValueTask) — contract primitives returning Result aren't drop-in. Scope refinement: two-mode primitive — requires_result() (Result-returning) vs requires_assert() (assertion-only). 3. TreatWarningsAsErrors=true makes warning vs error a false dichotomy. Scope refinement: contract-layer severity field; build-gate disposition is uniform (any reaching build = break); per-contract- class CI gating is separate future design question. 4. Dangling reference: memory/parallelism-scaling-ladder memo replaced with full filename for grep-ability. New "Migration concerns + scope clarification" section absorbs the findings. Open-design-questions updated with build-gate disposition question replacing the warning-vs-error false dichotomy. * fix(#1356 review): B-0142 internal-consistency reconciliation — scope no-throw rule explicitly to recoverable-user-facing-failures + Stream type precision
5 tasks
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Summary
Files `B-0142` — sibling of B-0141, both IDs reserved by Aaron 2026-05-01 in the parallelism-scaling-ladder memo's mechanized-guardrail table:
Both rows were named with B-NNNN IDs but never had per-row files filed. Otto 2026-05-03 audit pass (post-B-0141 filing) found B-0142 also missing.
Empirical evidence FOR B-0177 audit hypothesis
This row is the second concrete hit for B-0177's audit hypothesis ("a lot of backlog lost in our memories"). Pattern emerging:
All three referenced in 2026-05-01 memos with B-NNNN IDs but never had files until 2026-05-03 audit.
Row scope
Design-by-contract primitives integrated into F#/C# codebase:
L-effort due to: library selection (PostSharp / Fody / Roslyn analyzers / F# type providers / source-generators), Result-flow composition, prose-contract migration, CI integration.
Composes with
Test plan