[Issue 23561] std.typecons.Unique!struct does not destroy struct instance

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23561

--- Comment #2 from Vital <vital.fadeev at gmail.com> ---
But works when S is class:

class S
{
    ~this() { 
        i++; 
        writeln("DTOR: i == ", i ); 
    }
}

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