// Clean up on the way out.
Clean up on the way out.
Clean up on the way out .
fn drop(&mut self) {
        let entity_id = self.id.clone();
        self.session.lock().unwrap().remove_entity(&entity_id)
    }
fn drop ( & mut self ) { let entity_id = self . id . clone ( ) ; self . session . lock ( ) . unwrap ( ) . remove_entity ( & entity_id ) }
Clean up on the way out.
Clean up on the way out .
&mut self