{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":")"}]}
    ) -> Result<(DefId, ty::GenericArgsRef<'tcx>), ErrorGuaranteed> {
        poly_trait_ref: ty::PolyTraitRef<'tcx>,
        let trait_ref = self.instantiate_binder_with_fresh_vars(