use bevy::ecs::{
    component::{Component, HookContext},
    world::{DeferredWorld, World},
};

#[derive(Component)]
#[component(on_insert = on_insert_a)]
struct A;

fn on_insert_a(mut world: DeferredWorld, HookContext { entity, .. }: HookContext) {
    // This causes a panic in debug builds, but not in release builds.
    world.commands().entity(entity).despawn();
}

fn main() {
    let mut world = World::new();
    world.spawn(A);
}