// join.el — list-of-string join with separator.
fn run_test() -> String {
    let parts: [String] = native_list_empty()
    let parts = native_list_append(parts, "alpha")
    let parts = native_list_append(parts, "beta")
    let parts = native_list_append(parts, "gamma")
    return str_join(parts, ", ")
}

fn main() -> Void {
    println(run_test())
}