Program crash: GC destroys an object unexpectedly

[Steven Schveighoffer]

On 9/23/21 3:27 AM, eugene wrote:
> On Wednesday, 22 September 2021 at 18:38:34 UTC, Steven Schveighoffer 
> wrote:
>> Your experience is not typical though (clearly, as many of us 
>> long-time D users had no idea why it was happening).
> 
> Oh, yeah - I have special trait of bumping against
> various low probability things :)
> 
>> But for sure if this turns you off, I can understand how it can be too 
>> frustrating to learn the new rules.
> 
> Show me these rules!

They are here: https://dlang.org/spec/interfaceToC.html#storage_allocation

With the caveat, of course, that the recommendation to "leave a pointer 
on the stack" is not as easy to follow as one might think with the 
optimizer fighting against that. We need to add a better way to do that 
(similar to C# KeepAlive). I made an 
[attempt](https://code.dlang.org/packages/keepalive), but I think it's 
not guaranteed to work, I've already found ways to prove it fails.

-Steve