struct ReceiverPatternExpect[T] {
	value T
}

fn (e ReceiverPatternExpect[[]T]) array_item(value T) T {
	if e.value.len == 0 {
		return value
	}
	return e.value[0]
}

fn main() {
	ReceiverPatternExpect[[]voidptr]{
		value: []voidptr{}
	}.array_item(unsafe { nil })
}