+ type_with_fields = tdesc_create_union (feature, "svevnq");
+ field_type = tdesc_named_type (feature, "svevqu");
+ tdesc_add_field (type_with_fields, "u", field_type);
+ field_type = tdesc_named_type (feature, "svevqs");
+ tdesc_add_field (type_with_fields, "s", field_type);
+