agent: builder model: opus max_turns: 100 budget_usd: 20 —
Score: bugs lane (docs/priorities.md, bugs before moving): a checked program rustc refuses; found by b881 (0fa94bb), same family as #880/#881 (tools/buffers.nika origins).
Probe:
fn tail(head: String) -> String {
let mut st: String = head.clone()
let mut after: String = ""
st = after
let n: String = st.trim()
return n
}
fn main() {
print(tail(" x "))
}Seen: checks, then rustc refuses st = __keep.put_viewed(after) (Mismatched types). Expected: after is owned, st = after is a move, n is a copy of the trimmed text. Prints x.
crates/nikaia-std/src/tools/buffers.nika: a_local :190, copies_text :529, flow_into :719, origins_of :1083, origins_of_local :1178, method_origins :1209. Read the diffs of fef8e78, ae26238c (#880) and 0fa94bb (#881) first: the same mechanism.put_viewed is chosen in tools/emit_stmt.nika emit_stmt_put_call :77 (KeepAt::Param here: st is taken as reaching the String parameter’s keep). Other names: nikaia run scripts/where.nika -- NAME..., not grep -r.develop. Probe the variants: without st = after; let n = st.trim() untyped; return st.trim(); mut head: String used as st directly. Note which fail.let n: String = <view> copies text, so st and after do not reach the result’s keep) in buffers.nika; lower-std; commit the lowered file with it.tests/compiler/tests/string_reassigned_trim_result.nika + .stdout (the probe, plus the variants that failed in step 1). Commit ... (Fixes #883).If step 1 does not reproduce: still done, do step 3 to pin it, say so under Tests:.
All steps; nikaia test tests/compiler --both-settings; it filters keep, view, move, and the guard set of .claude/agents/builder.md. Changelog: one line if the compiler changed, else none.
The fix needs a language decision (what a lent binding’s move means), or an error in another agent’s file. #882 (a String parameter read through ?? counted as kept) is another lane’s: do not touch it.
Read docs/builder-facts.md.
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; commit after each step; git push origin develop fast-forward, no rebase (rejected: report Pushed: rejected, go on committing).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 two clones with target/ in the machine; delete your own clone’s target/ and target/release/nikaia-scratch at the end; report GB freed./home/user/Nikaia/docs/briefs/b883-reassigned-trim-result.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, Fixes, Pushed, Tests, Gate (green|red), Deviation, Found, Needs, Changelog, Owner, Disk freed. 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); 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); 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