Destroy All Memory Corruption

[IGotD-]

On Tuesday, 20 April 2021 at 01:12:22 UTC, Walter Bright wrote:
> I'll be doing a reprise of my DConf 2020 talk on Destroy All 
> Memory Corruption on April 21, 2021 at 7PM PST.
>
> https://nwcpp.org/
>
> Except this time it'll be live, not prerecorded.
>
> All are welcome!

One remark I found interesting regarding reference counting.

"In order to properly run the destructor, you have to run the 
destructor in an exception handler"

Why do you need to run the destructor in an exception handler?