Future of memory management in D

[JN]

On Thursday, 18 November 2021 at 14:56:40 UTC, rumbu wrote:
>>> * pattern matching on fields/properties
>>
>> How would this work?
>
>
> ```d
> switch (JSONValue)
> {
>    case JSONNumber n: writeln ("I have a number %s", n);
>    case JSONString s when s.Length > 100 : writeln("long 
> string");
>    case JSONString s: writeln("short string");
> }
>
> ```

Isn't that just std.sumtype/tagged union?