{"record":{"id":"5d0777a45abbab8a","repo":"Pumpkin-MC/Pumpkin","slug":"unexpected-event-5d0777","errorCode":null,"errorMessage":"unexpected event","messagePattern":"unexpected event","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/pumpkin-plugin-api/src/events/inventory/furnace_smelt.rs","lineNumber":13,"sourceCode":"use super::super::FromIntoEvent;\nuse crate::wit::pumpkin::plugin::event::{Event, EventType, FurnaceSmeltEventData};\n\n/// Event triggered when an item is smelted in a furnace.\npub struct FurnaceSmeltEvent;\nimpl FromIntoEvent for FurnaceSmeltEvent {\n    const EVENT_TYPE: EventType = EventType::FurnaceSmeltEvent;\n    type Data = FurnaceSmeltEventData;\n\n    fn data_from_event(event: Event) -> Self::Data {\n        match event {\n            Event::FurnaceSmeltEvent(data) => data,\n            _ => panic!(\"unexpected event\"),\n        }\n    }\n\n    fn data_into_event(data: Self::Data) -> Event {\n        Event::FurnaceSmeltEvent(data)\n    }\n}\n","sourceCodeStart":1,"sourceCodeEnd":21,"githubUrl":"https://github.com/Pumpkin-MC/Pumpkin/blob/8d4639e25a57c15e47448ec327c780d41bbf2356/crates/pumpkin-plugin-api/src/events/inventory/furnace_smelt.rs#L1-L21","documentation":"This panic fires in `data_from_event`, the `Event` trait implementation for `FurnaceSmeltEvent`. It matches only `Event::FurnaceSmeltEvent(data)`; any other `Event` variant means the dispatcher sent a wrong-type payload to the smelting handler. The library considers this a broken dispatch invariant and panics with \"unexpected event\".","triggerScenarios":"Dispatching a non-`FurnaceSmeltEvent` variant (e.g. `FurnaceBurnEvent`) to this handler's `data_from_event`, or registering the handler under a mismatched `EventType`.","commonSituations":"Handler registration tables that conflate furnace events, hand-written routing, or enum drift after upgrading pumpkin-plugin-api so the match arm no longer receives the expected variant.","solutions":["Register the handler for `EventType::FurnaceSmeltEvent` so dispatch only sends that variant.","Use `FurnaceSmeltEvent::data_into_event(data)` when constructing events for manual calls.","Synchronize versions and clean-rebuild the workspace to fix `Event` enum mismatch.","Check the variant first: `if let Event::FurnaceSmeltEvent(data) = event { ... }`.","Replace the panic with a logged error or typed failure for graceful handling."],"exampleFix":"// before\nmatch event {\n    Event::FurnaceSmeltEvent(data) => data,\n    _ => panic!(\"unexpected event\"),\n}\n// after\nmatch event {\n    Event::FurnaceSmeltEvent(data) => data,\n    _ => log::error!(\"FurnaceSmeltEvent handler received unexpected variant\"),\n    _ => return None,\n}","handlingStrategy":"type-guard","validationCode":"// Before dispatch\nassert_eq!(event.event_type(), EventType::FurnaceSmeltEvent, \"wrong event routed to FurnaceSmelt handler\");","typeGuard":"fn as_furnace_smelt(event: &Event) -> Option<&FurnaceSmeltEventData> {\n    match event {\n        Event::FurnaceSmeltEvent(data) => Some(data),\n        _ => None,\n    }\n}","tryCatchPattern":"let result = std::panic::catch_unwind(AssertUnwindSafe(|| handler.data_from_event(event)));\nif result.is_err() {\n    log::error!(\"FurnaceSmeltEvent handler received an unexpected event variant\");\n}","preventionTips":["Register the handler with EventType::FurnaceSmeltEvent.","Narrow the event with if-let before calling data_from_event manually.","Construct events via FurnaceSmeltEvent::data_into_event.","Align pumpkin-plugin-api versions across crates and rebuild cleanly.","Double-check EventType constants when duplicating furnace handler code."],"tags":["rust","panic","event-dispatch","inventory"],"backgroundTag":"internal-invariant-violation","analyzedSha":"8d4639e25a57c15e47448ec327c780d41bbf2356","analyzedAt":"2026-09-09T15:32:22.916Z","contentChangedAt":"2026-09-09T15:32:22.916Z","schemaVersion":2},"datasetVersion":"2026-09-16T04:17:20.429Z"}