{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
        let opaque_ty_def_id = self.local_def_id(opaque_ty_node_id);
    ) -> hir::TyKind<'hir> {
        let opaque_ty_hir_id = self.lower_node_id(opaque_ty_node_id);