{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"if"}]}
            if let Some(Binder { value: ExistentialPredicate::Trait(trait_ref), bound_vars }) =
        if let TyKind::RigidTy(RigidTy::Dynamic(predicates, _, _)) = self {
                predicates.first()