// Field-move ownership: Array moved into a struct must not be auto-dropped.
import Std::Io::{PrintLine};
import Std::Array::{Array, Array_New, Array_Push, Array_Len, Array_Get};
import Std::String::{String_FromInt, String_Concat};
import Std::Test::{Test_AssertTrue, Test_Pass};

struct Box {
    items: Array<int>;
}

func MakeBox() -> Box {
    var items: Array<int> = Array_New<int>(4);
    Array_Push<int>(&items, 10);
    Array_Push<int>(&items, 20);
    // Move `items` into the field — compiler skips Drop of `items`
    let b: Box = Box { items: items };
    return b;
}

func Main() -> int {
    let b: Box = MakeBox();
    Test_AssertTrue(Array_Len<int>(&b.items) == 2);
    Test_AssertTrue(Array_Get<int>(&b.items, 0) == 10);
    Test_AssertTrue(Array_Get<int>(&b.items, 1) == 20);
    PrintLine(String_Concat("sum=", String_FromInt(
    (Array_Get<int>(&b.items, 0) + Array_Get<int>(&b.items, 1)) as int64)));
    Test_Pass("move_field");
    return 0;
}