{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"[tcx.generics_of(fn_def_id).own_params.len()..],"}]}
                    [tcx.generics_of(fn_def_id).own_params.len()..],
                &tcx.generics_of(def_id.to_def_id()).own_params
                &mut predicates,