Why would an initialised struct pointer field be null in the struct's destructor?

[Stanislav Blinov via Digitalmars-d-learn]

On Sunday, 21 May 2017 at 23:59:08 UTC, Guillaume Piolat wrote:
> On Sunday, 21 May 2017 at 12:48:10 UTC, Adam D. Ruppe wrote:
>> Any struct should be able to have its destructor called
>
> Does this rule also applies to class objects?

Yes. If your destructor does modify the state, you should expect 
it to be called and have the state ready for it.

When you're using the GC, destructors *may* not be called under 
certain conditions:

http://dlang.org/spec/class.html#destructors

But there's no stopping you from destructing manually (via 
destroy() call), or by allocating classes manually via malloc or 
on the stack.