{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"ty::ExistentialTraitRef::erase_self_ty(tcx,"}]}
                        ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref)
                    supertrait_principal: supertrait_principal.map_bound(|trait_ref| {
                    }),