{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
    let mut body: Body<'tcx> = EarlyBinder::bind(body.clone()).instantiate(tcx, impl_args);
    let body = tcx.optimized_mir(*coroutine_def_id).future_drop_poll().unwrap();
    body.source.instance = instance;