const greeting = "Hello, "
const target = greeting + "世界"

value struct label:
    text: string

struct message:
    title: string = "untitled"
    payload: label

func echo(const text: string) -> string:
    return text

func entry(value: i32) -> i32:
    var empty: string
    var m = message(payload = label(text = target))
    const snapshot = echo(m.payload.text)
    var changed = snapshot
    changed += "!"
    if empty == "" and snapshot == "Hello, 世界" and changed != snapshot and m.title == "untitled":
        return value + 1
    return -100