{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
            let comp_res_type = nequal.ty(tcx, parent_ty, opt_data.child_ty);
            let nequal = BinOp::Ne;
            let comp_temp = patch.new_temp(comp_res_type, opt_data.child_source.span);