S = struct
{
    a: u32,
    b: u32,
    c: u64,
    d: u64,
    e: u64
}

require = fn (ok: u1) void
{
    if (!ok)
    {
        #trap();
    }
}

va_arg_function = fn [cc(c)] (first_arg: u32, ...) void
{
    >va = #va_start();

    >a = #va_arg(&va, u32);
    >b = #va_arg(&va, S);
    >c = #va_arg(&va, s64); 
    >d = #va_arg(&va, s32); 

    require(first_arg == 123456789);
    require(a == 123);
    require(c == -1);
    require(d == -2);
    require(b.a == 1);
    require(b.b == 2);
    require(b.c == 3);
    require(b.d == 4);
    require(b.e == 5);

    #va_end(&va);
}

S2 = struct
{
    a: u64,
    b: u64,
}

va_arg_function2 = fn [cc(c)] (...) void
{
    >va = #va_start();
    >s2 = #va_arg(&va, S2);
    require(s2.a == 8);
    require(s2.b == 9);
    #va_end(&va);
}

[export] main = fn [cc(c)] () s32
{
    >first_arg: u32 = 123456789;
    >a: u32 = 123;
    >b: S = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5 };
    >c: s64 = -1;
    >d: s32 = -2;
    va_arg_function(first_arg, a, b, c, d);
    >s2: S2 = { .a = 8, .b = 9 };
    va_arg_function2(s2);
    return 0;
}