Struct ItemStackedOnOtherEvent 

pub struct ItemStackedOnOtherEvent<'a, 'b> {
    pub event: &'a mut StackedOnOther<'b>,
    pub cancelled: bool,
}

What Hooks::item_stacked_on_other is told. Each field is that hook’s argument of the same name, described in the hook’s doc.

Fields

event: &'a mut StackedOnOther<'b>

cancelled: bool

Whether the event is cancelled: by the game or an earlier listener, or by this one setting it. Only a listener that receives cancelled events (#[listener(receive_cancelled)]) sees true, and setting it back to false lets the game’s behaviour run.