fix(engine): offer the face-down cast when only the {3} is payable - #7778
Conversation
CR 708.4 puts a face-down spell on the stack as a real spell, but the live
cost seam projects the spell into a `SpellCastRecord` and
`FilterProp::FaceDown` failed closed against that record — grouped with
battlefield-only predicates. "Face-down creature spells you cast cost {N}
less" therefore never matched anything.
The fact was already in the record: `cast_variant`. The ledger writes the
variant its caller announced, while the two live projections hardcoded
`CastingVariant::Normal`. `live_spell_cast_record_for` now states the one
variant the object itself evidences — `apply_face_down_entry_profile` has
blanked it (CR 708.2), which `GameObject::spell_is_cast_face_down` reads.
That predicate is phase-rs#5171's discriminator (`face_down && back_face.is_some()`,
exact against foretell/hideaway and against printed DFC back faces); it
moves to a named method so the restricted-mana payment seam and the filter
projection cannot answer the same question differently.
Playtest found a second half: the offer was judged against the printed {3}.
`effective_face_down_cast_cost` runs the same modifier passes the real cast
runs, so a reduction to {0} is castable with an empty pool, and the
`AlternativeCastChoice` menu now carries the reduced cost instead of {3}
while the payment takes {0} (the client renders that number verbatim).
Class (measured against card-data.json, 3 cards): Kadena, Slinking Sorcerer;
Dream Chisel; Obscuring Aether.
Counter-proof: with `FilterProp::FaceDown` back to `false`, three of the
seven regressions fail (`left: 0, right: 3`); with the offer-side modifier
pass removed, `kadena_lets_a_face_down_creature_be_cast_with_an_empty_pool`
fails alone. `a_face_up_creature_spell_is_not_reduced` and
`off_color_mana_pays_the_generic_face_down_cost` stay green either way —
they pin behaviour, they do not evidence this fix.
Not covered:
- A morph card whose PRINTED cost is unaffordable is still not OFFERED at
all, so this reduction stays unreachable from the UI in that case. Own
defect in candidate generation, filed as phase-rs#7770 with measurements.
- `zone_change_record_matches_property` still fails closed on
`FilterProp::FaceDown`; no card measured needs a face-down predicate
against a zone-change snapshot.
- The per-turn cast-limit filter is routed through the same authority for
consistency; 0 cards carry `FilterProp::FaceDown` in a cast restriction,
so that half changes no card's behaviour today.
- The offer resolves modifiers with no casting-variant context, which is
exact for this class (the object evidences the variant) but would not see
a variant-keyed reduction; 5 cards use one, all Flashback, none reachable
from a face-down offer.
Fixes phase-rs#7769
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Review find (matthewevans): `effective_face_down_cast_cost` projected
through `apply_cost_modifiers_to_base`, which passes no casting variant
and no permission index to `apply_all_cost_modifiers`, while the real
face-down prepare passes `Some(CastingVariant::FaceDown)` and its
elected permission. The projections could price different casts: with
no variant the permission election infers Foretell first for a foretold
exile card, while the explicit face-down cast routes through
`PlayFromExile` — and only that grant carries `cast_cost_raise`; a
`StaticCondition::CastingAsVariant` modifier was likewise invisible to
the projection.
`apply_cost_modifiers_to_base` keeps its signature (25 projection call
sites stay variant-less by design) and delegates to a new
`apply_cost_modifiers_to_base_for_variant`; the face-down projection
now elects its permission via `selected_object_cast_permission_index`
with the explicit `FaceDown` variant — the same authority the real
prepare uses — and threads both through.
The requested exile regression exposed a second defect on the same
path: the exile-exit cleanup cleared `face_down` unconditionally
(correct for the foretold/hideaway exile designation), stripping a
spell CAST face down of its status on the way to the stack (CR 708.4) —
which would in turn hide it from the face-down spell filter this PR
fixes. The cleanup now keeps the flag exactly for the casting move
(`to == Zone::Stack && spell_is_cast_face_down()`).
Tests (both discriminating):
- the_face_down_offer_from_exile_prices_the_play_from_exile_raise: the
menu must show {3}+{2}={5} and charge exactly that; the variant-less
projection shows {3}.
- an_unpayable_exile_raise_withholds_the_face_down_offer: with 3 mana
the {5} face-down cast is withheld and the legal face-up Foretell
cast proceeds; the variant-less projection auto-routes and the cast
dies in payment.
Counter-proofs (abort-guarded probes, run separately): threading
removed → exactly the two new tests fail, the seven prior stay green;
exile-exit guard removed → exactly the pricing test fails.
Class: no printed card carries a face-down-keyed `CastingAsVariant`
modifier (5 cards use the condition, all Flashback); the
raise/permission divergence is reachable through any `PlayFromExile`
grant with `cast_cost_raise` (Lightstall Inquisitor) alongside a
competing exile permission.
Not covered: the other per-keyword offer projections (dash, blitz,
spectacle, prowl, overload, cleave, mutate, awaken, impending,
prototype, warp, emerge) still project variant-less through the
unchanged wrapper — same latent divergence class, pre-existing there.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
A morph/megamorph/disguise card whose printed cost was not payable was never OFFERED, although dispatching `CastSpell` directly succeeded and auto-routed to the face-down cast (issue phase-rs#7770: three Islands could not cast a green morph creature from the UI). The offer gate (`castable_spell_verdict_with_probe`) judged a successfully prepared spell by its printed cost plus the casting-variant menu, and `CastingVariant::FaceDown` only enters that menu under an `unlimited_hand_cast_free_source` permission (Omniscience). Without one the offer said no while the reducer said yes. The prepare-FAILURE branch and the dispatch gate already asked the right three questions (effective keyword, permitted against the blanked 2/2 profile, {3} payable after cost modification). They are now one named predicate — `face_down_cast_is_feasible` — and the prepare-success branch asks it too, returning `prepared_cost: None` exactly like the failure branch (payment mode Auto, the mode the auto-route dispatches with). Reach: the verdict is shared by `can_cast_object_now` (dispatch preflight, effect-granted cast prompts) and the candidate emitters, so every consumer gains the same yes precisely where the reducer already accepted. Class (measured against card-data.json, 35,798 cards): 220 carry the keyword (141 Morph, 31 Megamorph, 48 Disguise). Counter-proof: with the success-branch rescue removed, the three discriminating tests fail (offer absent); the three pins stay green. Playtested: the three-Islands board and the Kadena empty-board case both offer the cast and resolve it face down. Not covered: - The casting-variant CHOICE MENU still lists FaceDown only under an unlimited free-cast permission; election without one keeps flowing through `AlternativeCastChoice` / the auto-route, unchanged. - The NoCost gate in `can_cast_prepared_now_with_probe` still pairs keyword + affordability without the `permitted` question (pre-existing). - Feasibility adds up to two state clones per morph card in hand, only in the printed-unaffordable case. Fixes phase-rs#7770 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughFace-down casting now uses authoritative cast-state detection and variant-aware cost projections. Offer generation, castability, filtering, exile transitions, and integration tests reflect modified face-down costs and casting permissions. ChangesFace-down casting flow
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to The PR broadens face-down cast offers to match successful dispatch behavior for eligible morph, megamorph, and disguise cards; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Castability
participant face_down_cast_is_feasible
participant apply_cost_modifiers_to_base_for_variant
participant ManaPayment
Castability->>face_down_cast_is_feasible: evaluate permission and affordability
face_down_cast_is_feasible->>apply_cost_modifiers_to_base_for_variant: project FaceDown cost
apply_cost_modifiers_to_base_for_variant->>ManaPayment: return modified effective cost
ManaPayment->>Castability: report face-down castability
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Current-head implementation review is clean for The face-down offer now threads the committed Holding only for current-SHA external evidence: no parse-diff sticky exists for this engine/parser-surface PR and required CI is pending. No code change is requested by this hold. |
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Inline comments:
In `@crates/engine/tests/integration/face_down_cast_offer.rs`:
- Around line 68-72: Add integration cases in the face-down cast offer tests for
one card using Megamorph and one using Disguise, with only the corresponding
face-down cost payable. Verify each offered spell is dispatched to the stack
face down, while preserving the existing Morph coverage and test setup patterns.
Apply the same fix in `@crates/engine/src/game/filter.rs` at line 4404.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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crates/engine/src/game/casting.rscrates/engine/src/game/filter.rscrates/engine/src/game/game_object.rscrates/engine/src/game/restrictions.rscrates/engine/src/game/zones.rscrates/engine/tests/integration/face_down_cast_offer.rscrates/engine/tests/integration/face_down_spell_cost_filter.rscrates/engine/tests/integration/main.rs
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Generated for head Parse changes introduced by this PR✓ No card-parse changes detected. |
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Parse-diff receipt: both entries are main's own movement, not this PR's.
I'll merge current main into the branch together with the Megamorph/Disguise coverage CodeRabbit asked for (accepted — the offer tests exercise only |
matthewevans
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Required: cover every supported face-down keyword sibling
At 817540e273c8da4674da4e4150b70f3b922d3549, object_has_effective_face_down_keyword covers Morph, Megamorph, and Disguise (crates/engine/src/game/casting.rs:10347-10358), but the new offer/cost regressions construct only Keyword::Morph (crates/engine/tests/integration/face_down_spell_cost_filter.rs and face_down_cast_offer.rs). Add discriminating Megamorph and Disguise coverage through the real offer/cast path so the three-keyword class cannot silently diverge.
The current parse receipt's removed signatures are acknowledged as main-baseline movement: this PR changes no parser files. That artifact does not itself allege a PR parser regression; the test sibling gap above is the required change.
… paths
Review find (matthewevans, CodeRabbit): the face-down offer/cost
regressions constructed only `Keyword::Morph`, while
`object_has_effective_face_down_keyword` spans Morph, Megamorph, and
Disguise — a regression narrowing that scan to Morph would have passed
every existing test.
Four discriminating siblings through the real cast path:
- offer: a Megamorph card and a Disguise card, printed {1}{G}
unpayable against three Islands, must be offered and dispatch face
down (face_down_cast_offer.rs).
- cost: Kadena reduces a Megamorph face-down cast to {0}; Dream Chisel
takes {1} off a Disguise face-down cast (face_down_spell_cost_filter.rs).
The branch also carries a merge of current main (5037022): the parse
receipt's two "removed" signatures were main-baseline movement
(phase-rs#7491's fail-closed classifiers); this branch touches no parser file,
so the regenerated receipt should be empty.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Accepted — sibling coverage landed in Four discriminating tests through the real offer/cast path, one per keyword sibling per seam:
Each asserts the spell reaches the stack face down and measures the mana actually paid, so a scan narrowed to Morph fails all four. The head also carries a merge of current main ( Suites on the merged head: fmt 0, clippy 0, |
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CI: shard 2/4 hit the 20m job time limit — no test failed. The job's own annotations: |
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Current-head implementation review is clean for The prior requested sibling coverage is now discriminating on both seams: Megamorph and Disguise are offered with only the generic Holding only for required CI: Rust tests shard 2/4 was cancelled on its 20-minute job limit, making the aggregate required Rust check fail. No test failure or code change is alleged by this hold. Please rerun the required Rust shard/check for this head; on green evidence this is ready for approval and queueing. |
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Reopen only to re-trigger the required CI run for the unchanged head |
Resolve the maintainer-caused integration-test conflict while preserving the stacked face-down cost-reduction behavior and the Morph/Megamorph/Disguise runtime coverage. Co-authored-by: cuinhellcat <217210902+cuinhellcat@users.noreply.github.com>
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Maintainer ported this PR across current The port is clean on hand review: the shared |
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CI is green on the current maintainer-port head |
matthewevans
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Approved on cfdd69a1fdeec28af286aaf02b60165e53bf5fe9.
The maintainer port preserves the offer/reducer parity at crates/engine/src/game/casting.rs:10673 and the current registered runtime coverage for Morph, Megamorph, and Disguise. The SHA-bound parse receipt reports no card-parse changes and required checks are green.
…cost grants (phase-rs#7948) * fix(engine): deny the face-down cast zone authority from alt-cost grants Fixes phase-rs#7945. CR 118.9a (only one alternative cost per cast) + CR 601.2b (never two alternative methods/costs on one spell): a "without paying its mana cost" exile grant is itself the alternative cost being applied, so it cannot admit the {3} face-down (morph/disguise) cast — which auto-routed and charged {3} whenever the printed cost looked unaffordable (phase-rs#7778's auto-route, correct from hand, wrong under an alt-cost grant). Three gates, one per admission path of the `FaceDown` variant: - `has_exile_cast_permission` is variant-aware: the alternative-cost arms (`ExileWithAltCost`, `ExileWithAltAbilityCost`, `ExileWithEnergyCost`, `Plotted`, `Foretold`) lend it no authority, and the head `PlayFromExile` check skips the land/look companion that `cast_from_zone.rs` installs alongside an alt-cost "play" grant. - `castable_zone`: the unowned-exile alt-cost branch, the during-resolution free-cast window, and the graveyard alt-cost/keyword branches are FaceDown-gated. Normal-cost authorities (hand, command zone, impulse `PlayFromExile`, Adventure, Warp, Lurrus-class graveyard permissions, top-of-library, battlefield exile-cast statics) are untouched. Known gaps: Bestow/Evoke/Prototype can still take zone authority from an alt-cost exile grant (same CR 601.2b class, separate follow-up); an independent impulse `PlayFromExile` coexisting with a free grant also loses its face-down offer (no source link distinguishes the companion). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(engine): elect face-down authority by provenance, not presence Review rework for phase-rs#7948, both blockers: - Typed provenance: `PlayFromExile.land_look_companion` marks the land-play/look companion that `cast_from_zone` installs alongside an alternative-cost grant. Cast elections and the face-down authority skip companions, so an independent impulse grant coexisting with an unrelated free grant keeps its legal face-down cast — the previous presence heuristic suppressed it (CR 118.9a: the impulse route is a normal-cost route; disguise supplies the single alternative cost). - A free `StaticMode::ExileCastPermission` (`WithoutPayingManaCost`, Maralen-class) no longer lends the face-down cast zone authority; a `PayNormalCost` static (The Matrix of Time class) keeps doing so (CR 118.9a + CR 601.2b). Serde: the marker is default-off and skipped when false — the wire form of every pre-existing grant is unchanged; pinned by a round-trip test. Not independently observable today: the companion filter inside `selected_object_cast_permission_index` (companions carry no cost riders); it keeps the elected provenance consistent with the authority gate. The coexistence case is pinned at the prepare admission gate (`face_down_cast_is_permitted`), not through the full payment loop. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * refactor(engine): type the PlayFromExile provenance as an enum Review follow-up for phase-rs#7948: replace the raw `land_look_companion: bool` with `PlayFromExileProvenance { Impulse, LandLookCompanion }` — the project's typed-enum rule for case distinctions, self-documenting and open for further provenance without another boolean. No bool-compat shim: the bool form never shipped (it existed only on the previous head of this branch); pre-marker grants deserialize to the `Impulse` default, and the default stays off the wire (round-trip test updated). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * docs(engine): annotate why the search-found play grant is Impulse provenance Review follow-up for phase-rs#7948: the search-found replacement grants a plain "you may play it" permission at normal costs (the any-color concession changes only how they are paid, CR 609.4b) — no alternative cost, so the grant is full cast authority (`Impulse`), preserving the one-alternative-cost invariant (CR 118.9a) at cast election. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(engine): search for an eligible normal-cost static, not the first source Review round-2 blocker on phase-rs#7948: the face-down admission filtered the RESULT of `exile_cast_permission_source`'s first-match scan, so an eligible free source ordered before an eligible `PayNormalCost` source hid the valid normal-cost authority and denied a legal face-down cast (CR 118.9a: the {3} face-down route is the sole alternative there). `exile_cast_permission_source_matching` applies a cost predicate INSIDE the scan, behind the same source gates (frequency slot, your-turn timing, pool membership, affected filter); the public first-match scan delegates with an always-true predicate. The face-down admission now searches for a `PayNormalCost` source. Regression `a_free_static_ordered_first_does_not_hide_a_normal_cost_static` (both statics active, free source ordered first, pinned down to `face_down_cast_is_permitted`); counter-probe (old filtered first-match restored) fails exactly that test — which also proves the free source really is scanned first in the fixture. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(engine): let a normal-cost CastFromZone grant authorize disguise Round-3 blocker on phase-rs#7948: a "you may play/cast that card" grant with ordinary payment (Nashi-class) is encoded as `ExileWithAltCost`, so the face-down gates treated it as an alternative-cost grant and a legal disguise cast through it was unreachable (CR 702.168a/b: disguise functions in any zone from which you could play the card). `ExileGrantCostProvenance { Alternative, NormalCost }` now types what the grant's cost IS: `NormalCost` marks the card's own printed cost restated (cast_from_zone `without_paying: false`, the SelfManaCost re-home, the prepared back face, resolution FullCost); everything else stays `Alternative` (the serde default — every pre-provenance grant reads as the CR-safe conservative form, pinned by a both-forms serde test). The face-down admission (permission arm + unowned/graveyard zone branches) accepts `NormalCost` grants as normal-cost routes; the face-down cast still never ELECTS an `ExileWithAltCost` slot, since cost preparation would substitute the grant's restated cost for the {3} — named limit: a `single_use` normal-cost grant is not consumed by a face-down cast. GameAction regressions (both through `GameRunner::cast`, printed {5} unaffordable, {3} floating): `a_normal_cost_cast_grant_lets_disguise_ cast_face_down` (CardPlayMode::Cast shape) and `a_normal_cost_play_ grant_with_companion_lets_disguise_cast_face_down` (Play shape with the land/look companion present). Counter-probe (provenance exception removed) fails exactly those two; the Dauthi regression stays green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * test(engine): resolve the fixture's mana pool by player id, not index 0 Review follow-up for phase-rs#7948: `exiled_disguiser_with_three_floating` takes `player` but wrote the floating {3} to `state.players[0]` — a future caller passing another player would fail for a reason unrelated to the behavior under test. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(engine): exclude alternative-rider statics from face-down authority Round-4 blocker on phase-rs#7948: a `PayNormalCost` static carrying a `CastCostMode::Alternative` extra-cost rider (Valgavoth, Terror Eater — pay life equal to mana value RATHER than paying the mana cost) is an alternative-cost authority; admitting it by base cost mode alone let it authorize the face-down alternative (CR 118.9a). `exile_cast_permission_source_matching` now hands its predicate the whole source, and the face-down predicate requires `PayNormalCost` AND no `Alternative` rider; an `Additional` rider (Dawnhand class) preserves ordinary payment and stays legal. GameAction regressions: `an_alternative_rider_static_cannot_authorize_ disguise` (admission denied; the cast still resolves through the static's own route — face up, pool untouched, life 5 paid) and `an_additional_rider_static_still_authorizes_disguise` (face down, {3} charged). Counter-probe (rider exclusion removed) fails exactly the Valgavoth test while the Additional test stays green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(engine): one face-down static authority for admission, election, and cost Round-5 blocker on phase-rs#7948: admission searched for an eligible normal-cost static, but the rider/cost reads fell back to the ordinary first-match scan (`elected_exile_permission_source`), so an earlier Valgavoth-class alternative-rider source could zero the face-down {3} and charge its pay-life rider while a later eligible source had granted admission. `static_source_eligible_for_face_down` is now THE shared predicate (`PayNormalCost`, no `CastCostMode::Alternative` rider): the admission uses it, and `elected_exile_permission_source` reselects with it for the `FaceDown` variant — every rider/cost read flows through that one function, so the admitted and the paying authority can never diverge. The face-down cast is also a first-class exile CANDIDATE now (parity gates with the hand branch): a payable exile-permission variant no longer short-circuits the cast as the single candidate, so the legal face-down election is surfaced beside it. The existing raise-pricing regression moved to the new `CastingVariantChoice` surface, which shows the same {3}+{2}={5} on its FaceDown option. Mixed-order GameAction regression `an_earlier_alternative_rider_source_never_pays_for_the_face_down_cast`: Valgavoth source created first, eligible source after it — electing FaceDown charges exactly the {3}, life untouched. Counter-probe (election back to first-match) fails exactly that test. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: matthewevans <matthewevans@users.noreply.github.com> Co-authored-by: cuinhellcat <cuinhellcat@users.noreply.github.com>
Fixes #7770. Stacked on #7771 — the first two commits are that PR; only the top commit is new here.
Defect. A morph/megamorph/disguise card whose printed cost was not payable was never OFFERED, although dispatching
CastSpelldirectly succeeded and auto-routed to the face-down cast (#7770's board: three Islands, a {1}{G} morph creature).Cause.
castable_spell_verdict_with_probejudges a successfully prepared spell by its printed cost plus the casting-variant menu — andCastingVariant::FaceDownonly enters that menu under anunlimited_hand_cast_free_sourcepermission (Omniscience). Without one the offer said no while the reducer said yes.Fix. The three questions the dispatch gate and the prepare-failure branch already ask (effective keyword, permitted against the blanked 2/2 profile, {3}-after-modifiers payable) are now one named predicate —
face_down_cast_is_feasible— and the prepare-success branch asks it too, returningprepared_cost: Noneexactly like the failure branch (payment mode Auto, what the auto-route dispatches with).Reach. The verdict is shared by
can_cast_object_now(dispatch preflight, effect-granted cast prompts) and the candidate emitters — every consumer gains the same yes precisely where the reducer already accepted.Class (card-data.json, 35,798 cards): 220 keyword carriers (141 Morph, 31 Megamorph, 48 Disguise).
Tests. 6 in
tests/integration/face_down_cast_offer.rs: the Islands board is offered and dispatches face down; the Kadena empty board is offered (needs #7771's modifier-aware affordability — the stacking reason); three pins (sorcery-speed timing respected, no morphless leak, printed-affordable unchanged — green without the fix, stated as pins). Counter-proof: with the success-branch rescue removed, exactly the three discriminating tests fail. Playtested: the Islands board and the Kadena empty board both offer the cast and resolve it face down. Suites: fmt 0, clippy 0,--lib19552,--test integration5375, 0 failed.Not covered.
AlternativeCastChoice/ the auto-route, unchanged.NoCostgate incan_cast_prepared_now_with_probestill pairs keyword + affordability without thepermittedquestion (pre-existing).Summary by CodeRabbit
New Features
Bug Fixes