agent: builder model: opus max_turns: 80 budget_usd: 16 —
Entry::or_default and Seq::cloned in std (#1082, ADR-384; unblocks C1a)Score: self-hosting lane. C1a (contracts/mod.rs, plan row C1) wrote around both (or_insert_with(fn() { collections::BTreeSet() }) for or_default, .map(fn(p) { p.clone() }) for .cloned()), which CLAUDE.md forbids; C1a re-runs after this and #1080 (bug lane b19). Decided by the architect in ADR-384 (obvious std counterparts of Rust calls); nothing goes to the owner.
Facts: Where things live, Traps already met, Commands
m.entry(k).or_default() = or_insert_with(fn { V() }), both maps, sync = true, touches = [], result ref V as or_insert_with’s. Offered for a V with a no-argument constructor (collection, String, number, bool, a struct whose fields all have defaults). Another V is refused with the existing code for a call whose type does not fit, help naming or_insert_with. If no existing code fits, stop: Needs: NK code (codes are the supervisor’s).xs.iter().cloned() = xs.iter().map fn(x) { x.clone() }; signature as Seq::map’s minus the lambda ([T](self: Seq[T]) -> Seq[T] ends sized, with sync/touches as map passes them). Views lower to Rust’s .cloned(); owned elements to any form rustc accepts.crates/nikaia-std/std.contracts: [fn."Entry::or_insert_with"] (:2681), [fn."Seq::map"] (:3064). Put each new entry beside them, with a comment in the style of its neighbours.crates/nikaia-std/src/map.rs:591 (or_insert_with on the crate’s own entry, TrustedMap’s) and crates/nikaia-std/src/seq.rs:631 (the pausing map’s or_insert_with) need an or_default twin where the lowering reaches them; seq.rs :263/:472 (map on Paused/Failing sequences) for cloned on those. Check with nikaia run scripts/where.nika -- or_insert_with which of the 13 callers are the emitter’s.docs/specification/30-nikaia-tooling.md: the std::collections paragraph (:1420, or_insert, or_insert_with and and_modify) names or_default; the Seq[T] paragraph (:382) names cloned beside map. One clause each, linking ADR-384.NK1171), under Tests::
```
use std::collectionsfn main() {
let mut m: collections::BTreeMap[String, collections::BTreeSet[String]] = collections::BTreeMap()
m.entry([“a”].join(“”)).or_default().insert([“x”].join(“”))
let names = [[“b”].join(“”), [“c”].join(“”)]
let copies: Vec[String] = names.iter().cloned().collect()
println(f”{m.len()} {copies.len()} {names.len()}”)
}
```
Expected 1 2 2.
Entry::or_default (contracts, runtime twins, refusal); Seq::cloned.Accepted (drop , to build).tests/compiler/tests/entry_or_default_seq_cloned.nika + .stdout (the probe, a HashMap[String, Vec[i64]] with or_default().push(1), cloned() over owned elements after a map), and entry_or_default_refused.nika + .stderr for a V with no no-argument constructor.
Commit std: Entry::or_default and Seq::cloned (Fixes #1082).The tests pass through nikaia test --project tests/compiler --both-settings, with the tests whose names contain entry, seq, clone, map (by name); lower-std fixpoint clean if a tools/*.nika changed; build, fmt, clippy, pre-push-check.sh; committed locally. Changelog: one line (the supervisor raises the version). Stop about 15 turns before max_turns: commit what is finished and report partial.
A fix is needed in the checker or the emitter beyond the call lowering of cloned and or_default (those you may change; name the functions in Body:); an error in another agent’s file.
Not yours, never stage: every file git status shows modified or untracked at your start, and every docs/briefs/* file except your report.
docs/builder-facts.md first. develop in the main checkout; git status at start: other agents’ uncommitted files are not yours, never touch or stage them.git add <files> only (scripts/commit.nika -- REPORT does it); commit locally after each step and never push: the driver runs the complete suite and pushes (.claude/agents/builder.md, Cheap checks only; owner, 2026-10-31).cargo build --profile fast -p nikaia, lower-std and its fixpoint when a tools/*.nika changed, cargo fmt, cargo clippy --all-targets -- -D warnings, scripts/pre-push-check.sh, the tests the brief names and the ones your change touches. No gate.nika.CHANGELOG.md, badges; no new NK code. New tests in Nikaia only; never the full suite. No foreground sleep, no polling; scripts in files.std or the toolchain lacks stops the work: no code around it unless an ADR or Part I-III refuses it (name it). Else Result: blocked, Found: gap + probe, Needs: architect decision (CLAUDE.md, A missing form stops the work).NIKAIA_CACHE_LIMIT=2G; at most two clones with target/ in the machine; delete your own clone’s target/ and target/release/nikaia-scratch at the end; report GB freed.Result: partial with what you ruled out, the probe, and the suspected file and function (.claude/agents/builder.md).target/fast/nikaia run scripts/commit.nika -- REPORT, which writes Pushed: local <sha> into it. A report without a Pushed: line, or with a placeholder left in (TC, DISK), is not done and cuts the batch (k3a1 2026-10-29: Result: done, nothing committed)./home/user/Nikaia/docs/briefs/s1082-or-default-cloned.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 (redesign) for a brief with Shape: redesign and no Convert: line). 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 process event such as another session resetting or rewriting your files is no Found:, it goes under Needs: (m3a 2026-10-28); 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:, nor a test’s expected .stdout/.stderr taken from what the program really prints where the brief’s sketch of it was short or wrong, b934 2026-10-29: say so in Body:, nor a lowering that follows the ADR governing it where the brief’s expected lowering contradicts that ADR, b933 2026-10-29: name the ADR in Body:, nor a lowering other than the brief’s where rustc cannot take the brief’s, b1029 2026-10-31: say why in Body:, nor re-keying an allow-list entry (KNOWN) whose hash changed for the same program and the same reason, b-fixforward-sweep2 2026-10-28: say so in Body:, nor an existing test’s expected .stdout/.stderr updated because your change rightly changes the message it prints, b1012b 2026-10-31: name the test 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