agent: builder model: opus max_turns: 120 budget_usd: 25 effort: medium —
comptime run of comptime_run.rs into comptime_bundle.nika (Part #125)Score: self-hosting lane, bootstrap lane 1 (docs/bootstrap.md). Plan row K3b of docs/selfhosting-plan.md (draft 32 %; prerequisites K3a and BT built, #920 built 8eb22790, #922 steps 1-2 built, step 4 by s922b-metadata-times.md right before this brief). S=2, C~3-5 M (comparable: P5d, the reverted GR b070adb9). Second of the batch; P5c (project.rs) runs after it and calls this brief’s comptime_bundle_write_if_changed.
Cut: crates/nikaia/src/comptime_run.rs:716-1264
Convert: –profile check-free –prefix comptime_bundle_
Shape: schematic host-calls (R295’s host parameter; Command::new(..).args(..).output() to process::run(program, [args]; dir:), as GR did)
Facts: Where things live, Traps already met, Moving Rust into Nikaia, Commands
The driver converts this before you start (.draft.nika, .notes, .rs). Ranges at 3157d5b1; if git log -- crates/nikaia/src/comptime_run.rs shows a later change, re-grep pub(crate) struct Bundle, ^pub(crate) fn unique_beside and cut again.
Pre-flight (s922b): grep -n 'fs::Metadata::modified' crates/nikaia-std/std.contracts must find the entry. If not, stop: Result: blocked, Needs: s922b first.
comptime_bundle.nika, doc comments carried over): run_bundle, run_fingerprint, read_record, bundle_text, bundle_dir, stamp_of, bundle_of, run, write_if_changed, the Flavour enum, RUN_SOURCE, RUN_PROFILE, NAMED, and a Nikaia ComptimeBundle { dylib: fs::Path, rlibs: Vec[(String, fs::Path)], deps: fs::Path, stamp: String, libdir: fs::Path }.struct Bundle (its fields are read by run_fast.rs :53-117 and grammar_run.rs :73-131: one adapter makes it from ComptimeBundle; fs::Path is PathBuf in the lowering, as dependencies_first project.rs :484 shows), CPU_LEVEL and build_for_cpu, NOT_BUILT, waited and the child’s spawn (a progress note every 10 s while the child runs: process::run has no such hook), LIBRARY_PATH’s cfg and the split_paths/join_paths of it, toolchain’s and target_libdir’s OnceLock, unique_beside’s counter (sysroot.rs :1369 calls it), cargo() and rustc() only if a Rust caller is left (else env::var("CARGO") ?? "cargo" in Nikaia). Every Rust pub(crate) function keeps its signature and becomes a forward: bundle, run_bundle, run, write_if_changed (imported by project.rs :45, called 10 times there, 3 in grammar_run.rs, 4 in run_fast.rs), rustc, toolchain, target_libdir.pub trait ComptimeBundleHost (one Rust unit struct implements it; a host method that throws lowers to Box<dyn Error>, builder-facts Host traits):
fn std_dir(ref self) -> fs::Path sync (Sysroot::resolve().std_dir())fn compiler(ref self) -> String sync (env!("NIKAIA_COMPILER"))fn rustc_version(ref self) -> String sync (orchestrator::project::rustc_version())fn runtime_dependencies(ref self, named: ref String) -> String sync (project::runtime_dependencies_for)fn user_cache_dir(ref self) -> fs::Path sync, fn use_entry(ref self, at: ref fs::Path) sync, fn where_tools_start(ref self) -> fs::Path sync (orchestrator::cache, until O1)fn artifacts(ref self, messages: ref String, named: ref Vec[String]) -> ComptimeBundleArtifacts sync with ComptimeBundleArtifacts { dylib: fs::Path?, rlibs: Vec[(String, fs::Path)] }: the serde_json loop of bundle_of (:953-981) and its DLL_EXTENSION test, as artifacts_in (plan Stays Rust)fn toolchain(ref self) -> String sync, fn target_libdir(ref self) -> String sync (the OnceLocks)fn cpu_level(ref self) -> String sync, fn not_built(ref self, key: ref String) -> String? sync, fn remember_not_built(ref self, key: ref String, detail: ref String) syncfn unique_beside(ref self, path: ref fs::Path) -> fs::Path syncfn run_child(ref self, binary: ref fs::Path, level: ref String, libraries: ref Vec[fs::Path], name: ref String) -> ComptimeBundleRan sync throws with ComptimeBundleRan { success: bool, stdout: String, stderr: String, status: String } (status is the ExitStatus’s Display): the spawn, RUST_BACKTRACE, LEVEL_VAR, LIBRARY_PATH with the held value appended, and waited; Nikaia catches a throw as DidNotBuild(f"running {binary.display()}: {e}").comptime_bundle_write_if_changed(path: ref fs::Path, text: ref String, partial: ref fs::Path) throws (pub; callers pass host.unique_beside(path); the Rust forward passes unique_beside(path) and maps the error to its String). The texts {path}: {e} stay byte for byte, with e now an io::IoError’s text (GR’s report said so too: name it in Body:).run throws CheckWall::Refused { detail } / CheckWall::DidNotBuild { detail } (check_reports.nika :15-25; the Rust Wall is it). Throwing it needs an impl Error for CheckWall in Nikaia: b070adb9 (git show b070adb9 -- crates/nikaia-std/src/tools/grammar_run.nika) wrote one; put it in comptime_bundle.nika (GR re-lands later and then drops its copy). The bundle functions throw pub enum ComptimeBundleFailed { Said(String) }, mapped to the String of today’s Result<Bundle, String>.process::run for cargo rustc ... (:938-948) and rustc ... (:1050-1080) with dir: host.where_tools_start(); rustc -vV and --print target-libdir stay behind the OnceLock host methods. A non-zero exit: out.status as process::run gives it (see process_within.nika for the field names). process::run throws on output that is not UTF-8 where Rust read it lossily: accepted, name it in Body:.run_fingerprint walks with fs::read_dir (sorted names) and fs::metadata(dir.join(name), fs::Root::Anywhere); newest is the largest modified().in_nanos(). fs::metadata follows a link where DirEntry::metadata did not: accepted (no link under std/), say so in Body:. Digests: hash::sha256_hex (crate::assets::digest is sha256_hex, assets.rs :245). bundle_dir keys with the first 16 characters of the digest.bundle_text calls cr_bundle_manifest and cr_bundle_source of comptime_driver.nika directly.block_on (nikaia_std::rt::exec::block_on), which works inside a comptime evaluation (GR’s report, its it grammar tests ran real builds).lower-std, git status --short crates/nikaia-std/src/tools/lowered/ must show only comptime_bundle.rs and lowered.rs as yours. Any other lowered file that differs from HEAD after a fresh build (a TrustedMap turned HashMap, as #1060) is Found: #1060 and stops the brief: do not commit a re-lowered file of another .nika. lowered/project_members.rs is uncommitted in the tree at the time of writing (residue of the reverted GR); git diff HEAD -- that file after your lower-std tells whether your file brings the drift back.crates/rs2nika/**, grammar_run.rs beyond its calls of what moves, project.rs beyond build_for_cpu’s call if needed, docs/briefs/* but your report, and the uncommitted files git status shows at start.target/fast/nikaia to your scratch dir before a long test run. The run bundle is 347 MB in the user cache (s920’s report): reuse it, do not clear the cache.comptime_bundle.nika with the host, the structs and the functions above; the Rust forwards and the host impl in comptime_run.rs; lower-std and its fixpoint. Tests: cargo test -p nikaia --test it -- comptime build_time run_fast grammar_at_build_time dsl_grammar (anchored grep -E '^test result:|FAILED|panicked'), nikaia test tests/compiler on the comptime* and run_* tests, --lib comptime_run::. Commit comptime: the bundle and the run move into Nikaia (K3b), Part: #125; plan row K3b updated (built, what stays Rust), self-hosting share in the body. Stop about 15 turns before max_turns, commit what is finished and report partial.Run 2 (report k3b-comptime-bundle.md.run2.report.md) built the whole move on branch wip/k3b-comptime-bundle-run2 (707d5e53) and stopped on one rustc error, PathBuf: From<EitherText> at lowered/comptime_bundle.rs, fixed by 1a5fdf6d (#1106). Pre-flight: git log --oneline -1 --grep='#1106' finds it on HEAD. Start from run 2: git cherry-pick --no-commit 707d5e53 (the architect checked with git merge-tree at e1a88e49: it applies clean), then git restore --staged crates/nikaia-std/src/tools/comptime_bundle.nika crates/nikaia/src/comptime_run.rs. Re-lower (do not hand-patch the lowered file), build, then run step 1’s tests and commit. What run 2 already decided stands: GR’s own impl Error for CheckWall (grammar_run.nika) is used, so no copy in comptime_bundle.nika; rustc, toolchain, target_libdir stay Rust (run_fast.rs calls rustc); the dead cargo() is gone. P5c (655b51b6) now calls write_if_changed from project_drive’s host: keep the Rust forward’s signature. lowered/emit_core_leaves.rs differs in the tree because of another agent’s uncommitted emit_core_leaves.nika: neither stage nor restore it (it is the #1060 guard’s known exception).
The first run (report k3b-comptime-bundle.md.run1.report.md) moved everything and stopped on two lowering defects, now fixed: #1077 (the tools preamble lacked the prelude’s time traits, Duration.in_nanos(), cf98a769) and #1078 (split_once parts through filter_map then a closure’s tuple pattern, 13177b7c; its shape probed by the architect at 0d8deb1f, it runs). Pre-flight: git log --oneline -1 --grep='#1077' and --grep='#1078' both find the fix on HEAD. Start from the first run’s move: git cherry-pick --no-commit 9a1678a8 (branch wip/k3b-comptime-bundle; cherry-pick, never merge: the branch sits on pre-rebase commits and a merge conflicts in docs/; the cherry-pick applies clean on 0d8deb1f), then git restore --staged those two files so scripts/commit.nika stages them. Do not hand-patch lowered/comptime_bundle.rs: re-lower and check that both former rustc errors are gone. Still to build from run 1: the Rust forwards write_if_changed, rustc, toolchain, target_libdir in comptime_run.rs. Correction to Facts: runtime_dependencies returns Vec[(String, String)] (project::runtime_dependencies_for), not String; the host method returns that.
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/k3b-comptime-bundle.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