{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
        let hir_id = self.local_def_id_to_hir_id(scope_def_id);
    ) -> Option<(Vec<&'tcx hir::Ty<'tcx>>, Span, Option<Span>)> {
        let mut v = TraitObjectVisitor(vec![]);