agent: builder model: opus max_turns: 120 budget_usd: 25 —
dsl.rs goes, and bounds_report.rs’s walk into Nikaia (lane 2, Part #125)Score: the bootstrap (docs/bootstrap.md): lane 2’s first slice, file-disjoint from P4a/P4b (project.rs) running in the main checkout. S=2, C~3-5 M. Target: about -300 Rust lines.
Owns: crates/nikaia/src/dsl.rs (deleted), crates/nikaia/src/bounds_report.rs, crates/nikaia/src/check/mod.rs and crates/nikaia/src/emit/mod.rs (only the two crate::dsl:: call sites), crates/nikaia/src/lib.rs (only mod dsl), new crates/nikaia-std/src/tools/bounds_report.nika, crates/nikaia-std/src/tools/dsl.nika, the generated tools/lowered/*. Not yours: project.rs (its call crate::bounds_report::report( at :2107 keeps its signature), bounds.rs, prove.rs, check.rs’s other code, contracts/sync.rs (call visit_stmt from Nikaia only if tools/sync.nika already has it; else keep the Rust walk and say so).
dsl.rs is a crossing (108 lines, 51 code): parameters, is_deferred, type_name, shadow_types, drivers, check all exist in tools/dsl.nika (:26, :94, :102, :111, :147, :179; the last three take ref winnow_grammar::InternerContext and ref Vec[Spanned[Item]]). Callers: emit/mod.rs:988 and check/mod.rs:381 (dsl::drivers(parsed)), check/mod.rs:418 (dsl::check(parsed)); comments in types.rs:13, traits.rs:9 name it (update the words). The callers call nikaia_std::tools::dsl::drivers(&parsed.interner, &parsed.items) (check how Parsed holds them) and dsl.rs is deleted with its #[cfg(test)] module: each of its three tests (a_hole_is_a_colon_and_a_name, a_path_and_a_time_are_not_holes, a_repeated_hole_is_one_parameter) becomes a tests/compiler case only if no test there covers it yet (grep -rl the hole forms in tests/compiler).bounds_report.rs (292 lines, 244 code): report (:47) runs crate::check::check, crate::prove::with_published, crate::bounds::proven (Rust drivers: they stay in report, which keeps its signature) and then the Walk (:154-276, over Block/Stmt/Expr with contracts::sync::visit_stmt), symbol (:277), blocked_index (:286), blocked_operation (:290), Site (:32). Move Walk, Site and the three helpers, and the text report builds after the analyses, into new tools/bounds_report.nika (prefix bounds_report_ where where.nika finds a clash); report passes what the analyses returned. Walk holds self and the source text: rs2nika --file without --profile check-free.std counterparts (Part III 17): BTreeMap/BTreeSet are std::collections; HashSet becomes a BTreeSet unless order shows in the output (it must not: same bytes first). self.source[..at] line counting: the text slice by bytes as in project_tests.nika; if a needed std call is missing, stop and report it under Needs:.--score under Rs2nika:. Do not change crates/rs2nika/. Under 60% kept is not your stop (the main session reads it), but say it.dsl.rs deleted, callers call tools::dsl directly; commit dsl: the crossing goes, the checker and the emitter call Nikaia (L2-1), Part: #125.bounds_report.rs’s walk and text into bounds_report.nika; report is the analyses plus one call; commit bounds_report: the walk into Nikaia (L2-1), Part: #125. Report the self-hosting % (python3 scripts/self_hosting.py | tail -3, after adding your new file to COMPILER_NIKA locally and not committing that edit: name the row under Body:).A lowering defect met is fixed in the compiler as its own commit with a test (Fix, do not work around); if it is more than one step, stop and report it under Needs:. Known open checker defect, not yours: #909 (write .clone() where rustc asks, name it in Body:).
nikaia test tests/compiler --both-settings (every count as before); it tests filtered on bounds report dsl shadow driver plus the guard set of .claude/agents/builder.md; nikaia --lib bounds passes; clippy clean; lower-std fixpoint in the worktree after the rebase. Changelog: none (a move).
An open design choice beyond the ones above; a .stderr, .stdout or report text that would change by one byte; a missing std call; an error in another lane’s file (docs/bootstrap.md, File ownership).
Read docs/builder-facts.md.
docs/bootstrap.md section 3)docs/builder-facts.md first. You work in the worktree /home/user/nikaia-lane2, not in /home/user/Nikaia (the driver’s builder works there; never edit, build or stage anything in it except your report file). Set up once: cd /home/user/Nikaia && git fetch origin develop && (test -d /home/user/nikaia-lane2 || git worktree add --detach /home/user/nikaia-lane2 origin/develop); then cd /home/user/nikaia-lane2 && git status (another agent of your checkout may have left files: not yours, report them). Build with cargo build --profile fast -p nikaia (incremental on, bootstrap.md section 3; CARGO_INCREMENTAL=0 only under 6 GB free); use only /home/user/nikaia-lane2/target/fast/nikaia, never another checkout’s binary.git add <files> only; commit after each step. Push: git fetch origin develop && git rebase origin/develop, rebuild, lower-std once more, commit any lowered file that changed (lowered: regenerate after rebase), then git push origin HEAD:develop; rejected: again, at most three times, then Pushed: rejected. A conflict in tools/lowered/*.rs or tools/lowered.rs is never merged by hand: git checkout --theirs -- <file>, git rebase --continue, rebuild, lower-std, commit.lower-std changed, yours and others’ (a compiler change re-lowers other files; that is correct in your tree). Do not edit docs/selfhosting-plan.md, docs/architect.md, docs/priorities.md, docs/bootstrap.md or scripts/self_hosting.py: rows for them go into Body: of your report.cargo fmt, cargo clippy --all-targets -- -D warnings, scripts/pre-push-check.sh, and the gate of .claude/agents/builder.md (#852).CHANGELOG.md, badges; no new NK code. New tests in Nikaia only; never the full suite. No foreground sleep, no polling; scripts in files.NIKAIA_CACHE_LIMIT=2G; at most three checkouts with target/ (C1, C2, C3); if df -h /home/user shows under 4 GB free, delete /home/user/nikaia-lane2/target and report blocked. At the end delete /home/user/nikaia-lane2/target/debug and /home/user/nikaia-lane2/target/release/nikaia-scratch (keep /home/user/nikaia-lane2/target/fast for the lane’s next brief) and report GB freed./home/user/Nikaia/docs/briefs/lane2-l21-dsl-bounds-report.md.report.md)Fields of docs/architect.md, Briefs and reports: Result: done|noop|partial|blocked (the bare word alone on that line: Result: done, never a summary after it, which cuts the batch, b869a 2026-10-27; Owner: is a question for the owner or none, never a role), Files, Commit, Body (optional, one paragraph for the commit message), Fixes, Pushed, Tests, Gate (green|red), Deviation, Found, Needs, Changelog, Owner, Disk freed, and for a move Rs2nika: (the kept N of M lines of rs2nika --score, then the three costliest hand edits; none for a task that moves no Rust). none where nothing, and then the bare word: Deviation: none (a note) cuts the batch (batch.nika compares exactly); a note goes into the commit message. Found: is only for a defect outside your change (it cuts the batch); a converter draft that came out wrong is no Found:, it is one of the costliest edits under Rs2nika:, which the converter lane reads (e12-4b 2026-10-27); how you solved your own step goes into the commit message. Deviation: is only a step of the brief built otherwise than written or not built (a choice the brief left to you, such as keep what X needs and say so, is no deviation: it goes into the commit message; nor is building two steps in one commit when every step is built, e12-3a 2026-10-27, nor a step another commit on develop already built, shown by your test failing with that commit’s change reverted, b889 2026-10-27: name the commit in Body:); how you verified (e.g. a test not run against the unfixed compiler) goes under Tests:. A noop says why under Tests: (what was probed), not under Deviation:. Final answer, one line: done <sha>, report <path> (or BLOCKED: ... / PUSH REJECTED ...).
Attribution: Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01GFeMqxRbtUMiGVyDMxsvEq