Making AssertError a singleton

[Andrei Alexandrescu via Digitalmars-d]

On 12/12/2016 11:35 AM, safety0ff wrote:
> On Monday, 12 December 2016 at 15:51:07 UTC, Andrei Alexandrescu wrote:
>>
>> But of course there are many situations out there.
>
> Wouldn't it break chained assertion errors?

Once a type in Error's cone gets thrown there is no guarantee of 
unwinding, hence no guarantee of chaining. -- Andrei