emilk/egui · error

PluginHandle: plugin is not of the expected type

Error message

PluginHandle: plugin is not of the expected type

What it means

Error "PluginHandle: plugin is not of the expected type" thrown in emilk/egui.

Source

Thrown at crates/egui/src/plugin.rs:125

impl PluginHandle {
    pub fn new<P: Plugin>(plugin: P) -> Arc<Mutex<Self>> {
        Arc::new(Mutex::new(Self {
            plugin: Box::new(plugin),
        }))
    }

    fn plugin_type_id(&self) -> core::any::TypeId {
        (*self.plugin).type_id()
    }

    pub fn dyn_plugin_mut(&mut self) -> &mut dyn Plugin {
        &mut *self.plugin
    }

    fn typed_plugin<P: Plugin + 'static>(&self) -> &P {
        (self.plugin.as_ref() as &dyn core::any::Any)
            .downcast_ref::<P>()
            .expect("PluginHandle: plugin is not of the expected type")
    }

    pub fn typed_plugin_mut<P: Plugin + 'static>(&mut self) -> &mut P {
        (self.plugin.as_mut() as &mut dyn core::any::Any)
            .downcast_mut::<P>()
            .expect("PluginHandle: plugin is not of the expected type")
    }
}

/// User-registered plugins.
#[derive(Clone, Default)]
pub(crate) struct Plugins {
    plugins: HashMap<core::any::TypeId, Arc<Mutex<PluginHandle>>>,
    plugins_ordered: PluginsOrdered,
}

#[derive(Clone, Default)]
pub(crate) struct PluginsOrdered(Vec<Arc<Mutex<PluginHandle>>>);

View on GitHub (pinned to d802a982ce)

When it happens

Trigger: Thrown at crates/egui/src/plugin.rs:125 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emilk/egui@d802a982ce (2026-08-16). Data as JSON: /api/errors/ea06435e03edf7d3. Report an issue: GitHub.