Program crash: GC destroys an object unexpectedly

[eugene]

On Monday, 13 September 2021 at 17:56:34 UTC, user1234 wrote:
> thx, so the problem is not what I suspected to be (mixed 
> gc-managed and manually managed memory). sorrry...

I am actually C coder and do not have much experience
with GC languages, so I did not even attempt to
try use D without GC yet, just want to understand
how all that GC magic works.

The programs does not contain manual malloc()/free(),
I am just not ready for such mix.