{"ast_node_type":"other","tokens":[{"end":16,"kind":"keyword","start":0,"text":"tcx,"}]}
            tcx,
        let fn_sig = tcx.fn_sig(assoc.def_id).instantiate(
            trait_ref.args.extend_to(tcx, assoc.def_id, |param, _| tcx.mk_param_from_def(param)),