{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
                    let kind = self.make_lowered_await(head_span, iter, FutureKind::AsyncIterator);
                    let iter = self.arena.alloc(self.expr_unsafe(iter));
                    self.arena.alloc(hir::Expr { hir_id: self.next_id(), kind, span: head_span })