{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
        let opaque_ty_parent_count = opaque_ty_generics.parent_count;
        let opaque_ty_generics = tcx.generics_of(opaque_def_id);
        let mut own_params = opaque_ty_generics.own_params.clone();