function is `@nogc` yet allocates closures with the GC work around!

[workman]

On Tuesday, 11 January 2022 at 13:32:58 UTC, Dennis wrote:
> On Tuesday, 11 January 2022 at 11:56:39 UTC, workman wrote:
>> Is there a workaround to made this work ?
>
> Make sure `doTask` takes a `scope` delegate.

To simple put, If the doTask is execute in other thread, do I 
need some things like volatile for fiber stack var I?