struct MyStruct[T] {
mut:
    pos    int
    buffer []&T
}

fn (mut s MyStruct[T]) add(e &T) bool {
    s.buffer[0] = unsafe { e }
    return true
}

fn fill(mut s MyStruct[i64]) {
    s.add(unsafe { &i64(123) })
}

fn test_generics_call_with_reference_arg() {
    mut s := MyStruct[i64]{
        pos:    1
        buffer: unsafe { []&i64{len: 2} }
    }
    fill(mut s)
    println(s.pos)
    assert s.pos == 1
    println(s.buffer.len)
    assert s.buffer.len == 2
}