{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
            let ready_field = self.single_pat_field(gen_future_span, x_pat);
            let x_expr = self.expr_ident(gen_future_span, x_ident, x_pat_hid);
            let ready_pat = self.pat_lang_item_variant(span, hir::LangItem::PollReady, ready_field);