{"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
        let opaque_ty_generics = tcx.generics_of(opaque_def_id);
        let trait_def_id = tcx.parent(fn_def_id);
        let opaque_ty_parent_count = opaque_ty_generics.parent_count;