{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
                let hir_id = HirId { owner: common_hir_owner, local_id };
            fcx_typeck_results.user_provided_types().items().map(|(local_id, c_ty)| {
                (hir_id, *c_ty)