type List[T] = struct {
    ptr: Int,
    len: Int,
    cap: Int,
};

function new(): List[Int] = (
    List { ptr: 0, len: 0, cap: 0 }
);

function push(list: List[Int], elem: Int) = (
    growIfNeeded(list, 1);
);

// PRIVATE:

function growIfNeeded(list: List[Int], elems: Int) = (
    if (list.len + elems) < list.cap then (
        let newMemory = std.rt.alloc.allocateItem(0_I32, 0_I32);
    );
);