{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
    let &rustc_hir::Closure { kind: hir::ClosureKind::CoroutineClosure(_), body, .. } =
fn coroutine_for_closure(tcx: TyCtxt<'_>, def_id: LocalDefId) -> DefId {
        tcx.hir_node_by_def_id(def_id).expect_closure()