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recurring_failure_mode: the dag target emits only its fixture row - #12877

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session/tidy-lark-233
Oct 1, 2026
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gunbai-bot[bot] merged 1 commit into
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session/tidy-lark-233

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@gunbai-bot gunbai-bot Bot commented Oct 1, 2026

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Records a finding from the MQ quoted-key round-trip item (node adhoc-2aa1c7ac-410, parent gentle-koi-724). The round trip required at #12740/#12758 cannot be written yet: the dag target has no emit route for ordinary .dag source.

Executed specimens (main cc2fefa, scratch probe via gunbc run, not landed):

  • parse_tree_to_emitted_node under dag_target_model() refuses parse_tree_atom_token_class_not_recoverable for data m: Int = 1, and identically for map literals.
  • emit_row_data_decl with a ^dag_surface_field_init_string_key expr refuses translate_grammar_relation_row_not_found via both target_serialize_source_from_model and target_serialize_source_from_selected_row.

Located cause: v2.extdeps.languages.dag dag_translation_rules_node enrolls one row (the fn add fixture); no data-decl/brace/string-literal/field_init_string_key emit rows; token_class_emit_transforms is empty; emit_row_* have no consumers.

Trigger (capability): dag_grammar_root productions are enrolled as the dag target emit rows, with a string-literal emit transform that re-escapes decoded text. Owner: neat-boar-16. The hand-authored type-decl fragment is recorded as the refused repair (it would fork the grammar). No expected-red claims are landed, per gentle-koi-724: with no route, a red cannot distinguish 'no route' from 'wrong round trip'.

Do not merge; neat-boar-16 enqueues.

🤖 Generated with Claude Code

…oted-key round trip waits on it)

Executed specimens at cc2fefa: parse_tree_to_emitted_node refuses
parse_tree_atom_token_class_not_recoverable for 'data m: Int = 1'; an
emit_row_data_decl over a field_init_string_key expr refuses
translate_grammar_relation_row_not_found. Trigger names the capability:
dag_grammar_root productions enrolled as the dag target emit rows, with a
string-literal emit transform that re-escapes decoded text.

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 1, 2026
Merged via the queue into main with commit c00e415 Oct 1, 2026
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gunbai-bot Bot deleted the session/tidy-lark-233 branch October 1, 2026 07:42
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