Is this a violation of const?

[Salih Dincer]

On Saturday, 30 July 2022 at 06:04:16 UTC, ag0aep6g wrote:
>
> Yes. Here's a modified example to show that you can also 
> violate `immutable` this way:


It's possible to do this because it's immutable.  You don't need 
an extra update() function anyway.

```d
void main()
{
     auto s = S("test A");
     s.update = (_) { s.s = _; };

     s.update("test B");
     assert(s.s == "test B");

     s.s = "test C";
     assert(s.s == "test C");
} // No compile error...
```

SDB at 79