fix(parser): #558 — honest-reject removed assume(...); fix misnamed fixture#598
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… fixture #558's premise is stale. Refinement/dependent types — and the `T where (P)` and `assume(predicate)` forms — were REMOVED 2026-04-10 (spec.md §711-713, §1849). `TRefined` does not exist in the AST and refinement syntax PARSE-ERRORS today; there is no silent-accept / accepts-wrong-program path, so this is not the live soundness hole the issue describes. The genuine residual defects are honesty ones: 1. The `ASSUME` keyword token was left dangling (no production) by the grammar removal, so `assume(...)` surfaced a cryptic generic parse error. Add a conflict-free honest-rejection production (ASSUME is a fresh token — zero new LR conflicts, verified: 68 s/r + 7 r/r unchanged) that raises a deliberate, named error pointing at the removed feature (CORE-05 deferred). 2. test/e2e/fixtures/refinement_types.affine contained only generic functions (no refinement, no `where`) yet produced a green "refinement_types" test — false coverage. Rename to generic_functions.affine + test_parse_generic_functions, and correct its header comment. NOT done here (out of scope / non-viable): - The refinement TYPE form `T where (P)` cannot be honestly fenced without regressing trait where-clauses: the shared `WHERE` token forces a shift/reduce decision before the predicate is visible (menhir resolves it by shifting into the refinement, breaking `fn f() -> T where C`). It still surfaces a generic parse error. - The doc-lies (CAPABILITY-MATRIX.adoc "TRefined parses", STATE/TECH-DEBT CORE-05 rows) are owner-only edits (strict SPDX-header pre-commit gate on .adoc/.md); flagged for manual reconciliation. - Dead error codes E0305/W0701 left in place (harmless; removal is churn). New tests (test/test_e2e.ml, "E2E Parse"): - generic_functions → parses (renamed, honest coverage) - assume() honest-rejection (#558) → deliberate parse error (negative) Full suite 452/452 green. Refs #558 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Context — the premise is stale
#558 reports refinement-type predicates that "parse but are silently not enforced (
TRefined)". Investigation shows this is no longer accurate:TRefineddoes not exist in the AST, and refinement/dependent types (includingT where (P)andassume(predicate)) were removed 2026-04-10 (spec.md§711–713, §1849). Refinement syntax parse-errors today — there is no silent-accept / accepts-wrong-program path, so this is not the live soundness hole the issue describes. The genuine residual defects are honesty ones, addressed here where viable.Changes
assume(...)honest-rejection (lib/parser.mly). TheASSUMEkeyword token was left dangling (no production) by the 2026-04-10 grammar removal, soassume(...)surfaced a cryptic generic parse error. Add a conflict-free production (ASSUME is a fresh token — zero new LR conflicts; verified 68 s/r + 7 r/r unchanged) that raises a deliberate, named error pointing at the removed feature.refinement_types.affinecontained only generic functions (no refinement, nowhere) yet produced a greenrefinement_typestest — false coverage. Renamed togeneric_functions.affine+test_parse_generic_functions, comment corrected.Deliberately out of scope
T where (P)honest-rejection is non-viable. It cannot be fenced without regressing trait where-clauses: the sharedWHEREtoken forces a shift/reduce decision before the predicate is visible, and menhir resolves it by shifting into the refinement — breakingfn f() -> T where C. It still surfaces a generic parse error.CAPABILITY-MATRIX.adoc"TRefined parses",STATE/TECH-DEBTCORE-05 rows) are owner-only edits — the strict SPDX-header pre-commit gate on.adoc/.mdblocks them. Flagged for manual reconciliation.E0305/W0701left in place (harmless; removal is churn).Tests
New
E2E Parsecases —generic_functions(parses, honest coverage) andassume() honest-rejection (#558)(deliberate parse error). Full suite 452/452 green.Refs #558 — recommend reframing the issue from "soundness" to "doc-truthing + hygiene"; the doc reconciliation is the remaining owner-gated step.
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