Does anyone understand how to use "shared" types with concurrency send/receive functions?

[Kagamin via Digitalmars-d-learn]

On Wednesday, 16 August 2017 at 12:58:25 UTC, Steven 
Schveighoffer wrote:
> Use cases don't matter. What matters is: is it proper for 
> Variant to call the postblit (as it does currently) without 
> regard for the qualifiers?

Looks like it isn't, https://dpaste.dzfl.pl/183e6dae9867 - shared 
reference counter with (probably) good enough postblit.