fix(engine): make the CR 603.4 hoist binding classifiers fail closed - #7491
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…hase-rs#7406) `filter_binding_diverges` and `gate_binding_diverges_at_fire_time` both ended in `_ => false`. In this module `false` means "both legs of the CR 603.4 hoist read this identically, so hoisting is safe", so every unclassified variant was silently asserted to be reproducible at fire time. That is fail-open in the destructive direction: a wrong `true` costs a conservative re-check, a wrong `false` gates the ability off the stack and, for a consumed one-shot, deletes it outright (`false_gate_consumes_one_shot`). The same tail on the sibling `QuantityRef` axis was already found wrong in practice. Both are now exhaustive and wildcard-free, matching the three sibling classifiers, so a new variant fails to compile until it is adjudicated. `filter_binding_diverges` newly declines the resolution-published population families the tail swallowed: the `last_*_ids` anaphora, tracked sets, the CR 607.2a linked-exile population and its order, the CR 609.7a chosen damage source, the CR 615.5 post-replacement window, and the CR 608.2k cost-paid referent. `Typed` also gained the CONTROLLER axis, adjudicated by a new `controller_ref_binding_diverges`. `ControllerRef::TargetPlayer` / `TargetOpponent` / `ParentTarget*` / `ChosenPlayer` / `ScopedPlayer` all read `ability.targets` / `chosen_players` / the per-iteration player, which the fire-time `FilterContext` (built with `ability = None`, `targets = &[]`) does not carry — it silently re-scopes the same printed population to the triggering player instead. That axis was reachable through every `Typed` filter while the arm read only `FilterProp::Another`. `gate_binding_diverges_at_fire_time` answers `false` or recurses for every arm `ability_condition_to_static_condition` can bridge today, so that half is pure hardening with no behaviour change; the resolution-scoped arms answer `true` on their own reading so widening the bridge cannot re-open the hole. The `FilterProp` payload axis of `Typed` is deliberately still out of scope and documented as such. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe trigger engine replaces wildcard divergence fallbacks with exhaustive classification for ability conditions and target-filter bindings. New tests cover resolution-scoped populations, controllers, properties, and delayed one-shot triggers. ChangesDelayed-trigger divergence classification
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change hardens several fail-closed classifiers, but two nested filter axes still use non-exhaustive matching, so future variants could be incorrectly treated as safe and hoisted. Merge should wait for exhaustive handling or explicit owner acceptance. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Generated for head Parse changes introduced by this PR✓ No card-parse changes detected. |
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Request changes — the TargetPlayer classifier is not grounded in the fire-time data model.
🔴 Blocker
[HIGH] TargetPlayer is treated as fire-time-safe even though its authority is a player target on the resolved ability. Evidence: crates/engine/src/game/triggers.rs:22065-22070 constructs ResolvedAbility with vec![] targets and claims the fire-time path would count the triggering player's creatures; crates/engine/src/game/filter.rs:1461-1467 instead resolves TargetPlayer (and TargetOpponent) solely from an actual TargetRef::Player in ability.targets. Why it matters: the fixture never exercises target-bound resolution, so it cannot establish that the classifier preserves or correctly declines the target-player population at fire time. Suggested fix: use a TargetRef::Player fixture with creature populations that distinguish trigger controller from target, and demonstrate both that fire-time evaluation has no target and that resolution reads the target-bound population; classify this controller reference conservatively until that behavior is represented correctly.
✅ Clean
The parse-diff artifact is bound to 925dfa959ac2a0d43b6ede45cc894a7af5d65934 and reports no card-parse changes.
Recommendation: request changes with the target-bound runtime proof and conservative classification above before reconsidering this hardening PR.
…board Review feedback on phase-rs#7491: the `ControllerRef::TargetPlayer` half of `resolution_published_population_gate_declines_the_fire_time_hoist` rode the shared `run` fixture, which builds its `ResolvedAbility` with `targets: vec![]`. With no player target on either leg, both the fire-time and resolution-time readings fall through to the same triggering-player population, so the row could show the decline happening but never that declining PRESERVES a correct outcome. Its assertion message claimed a divergence the board did not exhibit. Adds `run_target_bound`, which binds a real `TargetRef::Player` and splits the boards so the two legs genuinely disagree: * the TARGET (P1) controls two creatures -> resolution gate TRUE * the controller / triggering player (P0) has none, and `ZoneChangeRecord::test_minimal` pins the event's controller to P0, so the fire-time `Typed` arm falls back to P0 -> fire-time gate FALSE It then resolves the survivor and asserts `monarch == Some(P0)`, which is the part the old row could not state: a hoist here does not re-check, it DELETES a one-shot whose resolution-time gate was true. Confirmed discriminating by reclassifying `ControllerRef::TargetPlayer` as non-divergent and re-running: `stack` drops 1 -> 0. Also corrects the `TargetPlayer` / `TargetOpponent` comment in `controller_ref_binding_diverges`. It said both arms "fall back to the TRIGGERING player", which holds for `filter_inner_for_object`'s `Typed` arm but not for `filter::controller_ref_player`, which has no such fallback and answers `None`. Both readings diverge from the target-bound one; the comment now says so per site. No classification changed: `TargetPlayer` was already `true` (declines the hoist), which is the conservative answer. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Thanks — the evidence pointed at a real hole in the test, fixed in 36bcd7d. One correction on the framing first, because it changes what the fix needed to be. The classification was already the conservative one
It isn't. The test criticism is correct, and was the actual defectThe fixture genuinely could not establish what its assertion message claimed. Fixed with a dedicated
It then resolves the survivor and asserts Confirmed discriminating, rather than assumed: reclassifying Your
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Held pending current-head CI evidence. The previous Approval and merge-queue enrollment are paused because the available check-artifact downloads for this head are failing externally with HTTP 429, and the parse-diff sticky comment is still bound to prior head |
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Request changes — the current head is still not fail-closed across the Typed filter surface.
🔴 Blocker
crates/engine/src/game/triggers.rs:10715-10721 explicitly leaves the FilterProp payload axis unadjudicated, while filter_binding_diverges at :10727-10735 returns false for every property except Another. That includes payloads such as SharesQuality, InTrackedSet, and SameNameAsParentTarget that can depend on a nested/resolution-bound referent. A delayed trigger can therefore still hoist a condition whose fire-time and resolution-time populations differ—the failure mode this PR is meant to eliminate.
Extend the same authority with a recursive property-level divergence classifier (including nested filters and resolution-bound referents), then add a target-bound production-path regression that fails when that classifier is removed. The existing TargetPlayer case is a good shape, but it does not cover the omitted property axis.
✅ Clean
The current TargetPlayer fixture does repair the previous review’s specific target-binding test gap: it reaches the real delayed-trigger path and distinguishes the two player populations.
Recommendation: request changes — complete the Typed property axis before claiming the hoist classifiers fail closed.
Review feedback on phase-rs#7491: `filter_binding_diverges`'s `Typed` arm read `tf.properties` only for `FilterProp::Another` and let all 98 other properties through as "cannot diverge". A delayed trigger could therefore still hoist a gate whose population is narrowed by a property the fire-time context cannot reproduce — the exact failure mode this PR exists to close, one level further down than the tail it started with. Adds `filter_prop_binding_diverges`, exhaustive and wildcard-free over all 99 `FilterProp` variants, plus `player_filter_binding_diverges` (26 variants) and `count_scope_binding_diverges` for the sub-axes it reaches. Nested payloads recurse into the classifier that owns them rather than being re-derived: `filter_binding_diverges` for a nested `TargetFilter`, `controller_ref_binding_diverges` for a controller scope, and `quantity_expr_binding_diverges` for a comparison operand — which also closes CR 107.3a, since `Counters`/`Cmc`/`PtComparison` can carry `Variable("X")`. Newly declining: * ability-bound SameNameAsParentTarget, AttachedToRecipient, CombatRelation{ParentTarget}, CountersPutOnThisTurn {ScopedPlayer} * resolution ledgers InTrackedSet, MatchesLastChosenCardPredicate, ManaValueParity{LastNamedChoice}, SameNameAsExiledBySource * event, no fallback CouldBeTargetedByTriggeringSpell * PlayerFilter TriggeringPlayer and its three opponent-of variants, ZoneChangedThisWay, PerformedActionThisWay, VotedFor, TrackedSetPossessor, OwnersOfCardsExiledBySource, ChosenPlayer, ParentObjectTarget{Controller,Owner} Each verdict comes from the READER, not the variant name, which splits two pairs that look alike: * `ControllerRef::TriggeringPlayer` does NOT diverge (its reader `triggering_event_player` falls back to the detection thread-local), while `PlayerFilter::TriggeringPlayer` and `CouldBeTargetedByTriggeringSpell` DO (their readers consult `state.current_trigger_event` and nothing else, so they answer `false` for every candidate at fire time). * a choice PERSISTED on the source (`chosen_attributes`, chosen creature type) does not diverge; one published into global state by a resolution (`state.last_named_choice`) does. `CanEnchant` recurses rather than declining outright: its reader `referenced_targets_for_filter` returns the empty list for every filter except `ParentTarget`/`ParentTargetSlot`, so it diverges exactly when the nested filter does. New regression `resolution_scoped_filter_property_declines_the_fire_time_hoist` uses the target-bound shape the reviewer asked for: three identically-named creatures with the delayed ability targeting one, gated on `ObjectCount{creature with SameNameAsParentTarget} >= 2`. Resolution counts three; fire time counts none, because `parent_target_name` opens with `let ability = ability?`. It resolves the survivor and asserts the monarch changed, so the decline is shown to preserve a live ability rather than merely re-check one. `FilterProp::NonToken` is the leg-independent reach-guard. Confirmed discriminating by restoring the `Another`-only property check and re-running: `stack` drops 1 -> 0 with `monarch == None`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Done in What landed
The three properties you named are all covered: Newly declining:
Every verdict comes from the reader, not the variant nameThat distinction split two pairs that look identical from the type definition:
The regression, in the shape you asked for
Confirmed discriminating, per your "fails when that classifier is removed": restoring the Verification
One note on the CI stateThe four still-red checks on the previous head were all HTTP 429s from GitHub's action-download CDN ( |
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Actionable comments posted: 1
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Inline comments:
In `@crates/engine/src/game/triggers.rs`:
- Around line 11009-11018: Replace the matches! classifiers for
FilterProp::ManaValueParity and FilterProp::CombatRelation with dedicated
exhaustive, wildcard-free match helpers placed alongside
count_scope_binding_diverges. Match every current ParitySource and
CombatRelationSubject variant explicitly, preserving the existing classification
results while ensuring newly added resolution-scoped variants require
compiler-reviewed handling.
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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/triggers.rs
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Current-head review — changes requested
Reviewed head 8f271522387446b4af2bd7f6da0adde76eb3f742. Required CI is green and the current SHA-bound parse-diff receipt reports no card-parse changes.
The new property classifier still has two implicit fail-open sub-axes. filter_prop_binding_diverges says each payload is adjudicated exhaustively and wildcard-free, but ManaValueParity classifies ParitySource with matches! at crates/engine/src/game/triggers.rs:11007-11011, and CombatRelation does the same for CombatRelationSubject at :11012-11018. A future resolution-scoped variant on either enum then evaluates as false without a compiler-required decision and allows the CR 603.4 hoist—the same failure mode this PR removes for TargetFilter and FilterProp.
Replace both shortcuts with exhaustive matches (fixed parity/source subject => false; LastNamedChoice/ParentTarget => true) and add the matching classifier assertions. This keeps the classifier's stated fail-closed extension contract real rather than relying on the present two-variant enums.
The prior TargetPlayer and omitted FilterProp-axis requests are resolved at this head; the current unresolved CodeRabbit thread independently identifies this remaining issue.
Review feedback on phase-rs#7491 (and an independent CodeRabbit thread): `filter_prop_binding_diverges` claimed each payload was adjudicated exhaustively, but classified `ParitySource` and `CombatRelationSubject` with `matches!`. A `matches!` IS a wildcard — it compiles a two-variant enum into "the one I named, else safe" — so a future resolution-scoped variant on either would answer `false` and permit the CR 603.4 hoist with no compile error. That is the same tail this change set removes one and two levels up, reintroduced at the leaf. Both are now `parity_source_binding_diverges` and `combat_relation_subject_binding_diverges`, exhaustive and wildcard-free. Swept the rest of the classifiers rather than fixing only the two reported, on the rule that a sub-axis needs its own exhaustive classifier when it names a REFERENT (a player, an object scope, a subject the fire-time context might not bind). That found three more the review did not name: * `PtComparison.scope` was discarded entirely through `..` — now `pt_value_scope_binding_diverges` (both scopes read a characteristic of the MATCHED object, so the verdict is unchanged; the guarantee is not); * `ControlsCount.relation` / `PlayerAttribute.relation` — now `player_relation_binding_diverges`; * `OpponentAttacked.subject` — now `attack_subject_binding_diverges`. Fields still discarded through `..` are documented in a BINDING-FREE PAYLOADS note at the end of the match, with the reason each cannot acquire a referent: characteristic selectors (`PtStat`, `SharedQuality`, `CounterMatch`, `AttachmentKind`, `DamageKindFilter`, `Zone`), polarity flags (`SharedQualityRelation`, `SourceExclusion`), comparison data, and the one genuinely interesting case — `AttackScope`, a time WINDOW. Both legs read the same window, and state moving between them is what CR 603.4's two checks are FOR, not a divergence in the sense this module screens. Proven by construction, since `matches!` and an exhaustive match are indistinguishable at runtime: adding a probe variant to `ParitySource` makes `triggers.rs` fail to compile with the exhaustive match and produce ZERO errors with the `matches!`. The runtime pins added alongside cover the split that exists today; the exhaustive match is what covers the variants not yet written. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Fixed in The two you named
Three more, from sweeping rather than patchingI took the instance as a sample rather than the population, since that is what the last two rounds taught. The rule I applied: a sub-axis needs its own exhaustive classifier when it names a REFERENT — a player, an object scope, or a subject whose identity the fire-time context might not bind. That surfaced three the review did not name:
And a note on what stays discardedSweeping everything would be noise, so the fields still taken with The one genuinely interesting case is ProofRuntime pins can't distinguish Verification
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@matthewevans — ready for re-review on CI: every required check green (4 Rust shards, Rust lint, card data, frontend, WASM, lobby worker, security scan; Tauri and draft pools skipped). No 429s this run. Parse-diff receipt: now SHA-bound to Your last blocker, the Two things I'd specifically like your eye on, since both are judgment calls rather than mechanical fixes:
Three rounds, three real defects, each one level below the last — wildcard tail, then unadjudicated |
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Approved at 987f4afaefee7f34b357db29ccf14e390aa6fd58: the CR 603.4 hoist classifiers are now exhaustive through their referent-bearing sub-axes, and the current SHA-bound parse receipt and required CI are clean.
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@matthewevans — ready for another look, at Your last review flagged the two
Sweeping all seven classifiers in the guard family — CI is green on this head, and the Card data job re-bound the parse-diff receipt to Two follow-ups I'd rather record than leave implicit. Neither is a merge gate, and I'm happy to split either out:
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… 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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Fixes #7406.
The defect
filter_binding_divergesandgate_binding_diverges_at_fire_time(crates/engine/src/game/triggers.rs) both ended in_ => false. In this modulefalsemeans "both legs of the CR 603.4 hoist read this identically, so hoisting is safe", so every unclassified variant was silently asserted to be reproducible at fire time.That is fail-open in the destructive direction. A wrong
truecosts a conservative re-check; a wrongfalsegates the ability off the stack and, for a consumed one-shot, deletes it outright (false_gate_consumes_one_shot). The same tail on the siblingQuantityRefaxis was already found wrong in practice in #7389, which is why that one was made exhaustive there and this one was split out.Both classifiers are now exhaustive and wildcard-free, matching
object_scope_unbound_at_fire_time/player_scope_unbound_at_fire_time/quantity_ref_binding_diverges, so a new variant fails to compile until it is adjudicated.filter_binding_diverges— all 54TargetFiltervariantsNewly declining, i.e. the families the tail swallowed:
LastCreated,LastRevealed,LastZoneChanged,TrackedSet,TrackedSetFilteredQuantityRef::TrackedSetSizealready declines under.ExiledBySource,ExiledCardByIndexQuantityRef::CardsExiledBySource/CardTypeSetSource::ExiledBySourceverdicts.CostPaidObjectResolvedAbility, which isNoneat fire time — the population-level counterpart ofObjectScope::CostPaidObject.ChosenDamageSource,PostReplacementSourceController,PostReplacementDamageSource,PostReplacementDamageTarget,PostReplacementDamageTargetOwnerEverything else is adjudicated non-divergent with its reasoning inline: literals and snapshots, controller-derived players, source-relative reads served by the
TriggerSourceContext, durable per-source/per-player choices, and the matched-event referents (which both legs read through thecurrent_trigger_event-or-DETECTION_TRIGGER_EVENTdual path — the same argumentObjectScope::EventTargetandPlayerScope::DefendingPlayerare already non-divergent under).A second fail-open inside the arm that was already there
TargetFilter::Typedread onlytf.propertiesforFilterProp::Anotherand ignoredtf.controllerentirely.ControllerRef::TargetPlayer/TargetOpponent/ParentTargetController/ParentTargetOwner/ChosenPlayer/ScopedPlayerall readability.targets,ability.chosen_playersor the per-iteration player. The fire-timeFilterContextis built withability = Noneandtargets = &[], soTargetPlayersilently falls back to the triggering player and counts a different population — with no gate rejection to catch it. That axis is reachable through everyTypedfilter in the engine, which makes it the widest door into the hoist decision.New
controller_ref_binding_divergesadjudicates all 14 variants;TypedandStackAbilityboth consult it. This is slightly beyond the issue's literal text, but the issue asks each variant to be justified against the module's one question, andTypedcannot be answered honestly without it.gate_binding_diverges_at_fire_time— all 57AbilityConditionvariantsEach is adjudicated on its own reading rather than on "does the bridge pass it". The old tail was inert only because
ability_condition_to_static_conditionhappens to decline the arms it covered — a claim about a different function, silently re-underwritten every time that bridge grows an arm.Every arm the bridge passes today (
IsYourTurn,CompletedDungeon { specific: None },SourceAttachedToCreature,ControlsCommander,QuantityCheck,Not) answersfalseor recurses, so this half is a pure hardening change with no behaviour difference — pinned by a test.SourceMatchesFilter/ControllerControlsMatching/WasStartingPlayernow recurse into their filter and controller payloads.Deliberately out of scope
The
FilterProppayload axis ofTyped— ~90 variants, several carrying nestedTargetFilters and resolution-scoped referents. It is documented as unadjudicated in the function's doc comment rather than left implicit, and wants its own pass.Behaviour change
Only in the conservative direction: the shapes above stop being hoisted and keep today's resolution-only reading, costing CR 603.4's fire-time half for those gates. No hoist that happens today stops happening for any other reason, and nothing newly hoists.
Verification
cargo fmt --allclean;cargo clippy -p phase-engine --all-targets -- -D warningsclean.docs/MagicCompRules.txtbefore being written.resolution_published_population_gate_declines_the_fire_time_hoistdrives two production minimal pairs (ObjectCount{F} >= 2, differing only inF) plus per-family unit pins, and asserts the four payload-free bridging gates still hoist.divergent_gate_bindings_decline_the_fire_time_hoist,non_battlefield_presence_gate_declines_the_fire_time_hoist,resolution_scoped_quantity_gate_declines_the_fire_time_hoist— pass unchanged and still assert what they intend. They scope their populations withControllerRef::You, which remains non-divergent, so the new controller screen does not silently relax them.Not checked against real cards:
card-data.jsonis gitignored and not generated in this worktree. The issue records that no card is known to reach a misclassified filter, and every change here declines rather than admits a hoist, so the worst case is a delayed trigger losing CR 603.4's fire-time half rather than one deleted off the stack.🤖 Generated with Claude Code
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