index = struct_class->fields->len - 1; /* last field (new) */
field = &g_array_index(struct_class->fields, struct field, index);
field->name = g_quark_from_string(field_name);
index = struct_class->fields->len - 1; /* last field (new) */
field = &g_array_index(struct_class->fields, struct field, index);
field->name = g_quark_from_string(field_name);