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Declare #12944's unwitnessed emitted list_at route as a frontier row - #12978

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jb500-listat-frontier
Oct 2, 2026
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gunbai-bot[bot] merged 1 commit into
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jb500-listat-frontier

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@gunbai-bot gunbai-bot Bot commented Oct 2, 2026

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#12944 (list_at_optional as the projection of the get primitive) merged at 6749523 with one undischarged condition: no claim executes the emitted route. list_at_equivalence_test covers the seed interpreter's native read against list_at_reference, but nothing emits, builds and runs a program that reads through v1_rt::list_get_optional.

That fixture would extend the emit_host_identity_cast_native scaffold's population, which is the operator's call (escalation msg_7bdba37a, never decided). So this PR declares the gap instead of leaving it silent: one FrontierRow in gunbc.resolver_cost_frontier, citing v1.compiler.runtime_rust rt_collection_ops. Its dissolution is an executing emit-build-run route covering in-range, end, past-end and negative indices with explicit expected values. If the operator approves the identity-cast fixture, that fixture replaces this row.

The module is already rostered through gunbc.census_closure_frontier, so the dissolution census reads the new row; CI's floor checks it. Data only: no code, no generated files.

🤖 Generated with Claude Code

list_at_optional's emitted realization (v1_rt::list_get_optional) has no executing
emit-build-run claim. #12944 merged before the operator decided on extending the
identity-cast scaffold to carry that fixture (msg_7bdba37a), so the gap is declared here
with its dissolution trigger instead of being left silent.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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gunbai-bot Bot added this pull request to the merge queue Oct 2, 2026
Merged via the queue into main with commit 3756d62 Oct 2, 2026
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gunbai-bot Bot deleted the jb500-listat-frontier branch October 2, 2026 08:46
@briansrls
briansrls restored the jb500-listat-frontier branch October 2, 2026 13:19
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