a_union
.union_sz = sizeof(union a_union),
union a_union f2;
union a_union f3;
out->union_exists = bpf_core_type_exists(union a_union);
out->union_matches = bpf_core_type_matches(union a_union);
out->union_sz = bpf_core_type_size(union a_union);
out->targ_union = bpf_core_type_id_kernel(union a_union);
union a_union t2 = {};
out->local_union = bpf_core_type_id_local(union a_union);