A Riddle: what is wrong with this code using std.array.Appender?

[Daniel Kozak]

On Mon, Mar 25, 2019 at 4:00 PM FeepingCreature via Digitalmars-d <
digitalmars-d at puremagic.com> wrote:

> class Class
> {
>      Appender!(int[]) app = null;
> }
>
> This is the most evil bug I've seen this year yet.
>
> Hint: Appender is a struct, not a class. So what does "= null"
> do, when it appears as a default initializer?
>
>
Yeah I remember this bug. But to be honest I believe it is already fixed,
but few days ago I still write something like this to be sure:
class Class
{
     Appender!(int[]) app;

    this()
    {
        app = appender!(int[]);
    }
}
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