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agent: builder model: opus max_turns: 100 budget_usd: 20 —

Brief: #1005, .to_string() of an owned or number local read as a view

Score: bug lane, a false refusal (S=1) in the text tiers b998 just touched; let s = ...; return s.to_string() is a common shape in moves (K3a part 2 builds text this way). Touches text_tiers.nika only. Builders have no GitHub: the issue text is copied below.

Problem

.to_string() of an owned local is read by the text tiers as a view, so a -> String function that returns it is refused. ADR-282 D8: on text, .to_string() answers the receiver’s own type (owned text stays owned); of a number it is new text. Found by b998 (f2599c1c, which fixed the declared-number and match-payload cases only).

Probe (target/fast, develop f2599c1c)

fn f(n: i64) -> String {
    let s = f"a{n}"
    return s.to_string()
}
fn main() { println(f(3)) }

NK1104 at :3 “declared to return ref String”. Expected a3.

enum BV { Int(i64), Text(String) }
fn g(got: BV) -> String {
    let s = match got { BV::Int(i) => i, else => 0 }
    return s.to_string()
}
fn main() { println(g(BV::Int(4))) }

NK2302 at :4. Expected 4 (s is an untyped let of a number).

Locations

To build

  1. Probe both rows on a fresh build; also let s = "x".to_string() + "y"; return s.to_string() and let s: String = ... typed.
  2. A local whose kinds are owned (a new String: f"...", +, clone) keeps owned through .to_string(); a local whose type is a number, bool or char (also untyped, from its initializer) gives new text. Fix where the local’s kinds are formed, not at the report.
  3. Test (all rows), lower-std fixpoint, the it guard set, text_tiers:: and views_kept::. Commit Fixes #1005.

Notes

Rules (CLAUDE.md; this block is pasted into every brief, also a fix-forward)

Report (at most 15 lines, to exactly /home/user/Nikaia/docs/briefs/b1005-to-string-owned-local.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 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:); 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

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