How to implement Canceleable spawn() from parent

[aberba]

On Tuesday, 30 June 2020 at 14:43:40 UTC, Steven Schveighoffer 
wrote:
> On 6/30/20 10:15 AM, Simen Kjærås wrote:
>> [...]

My thinking is I don't want regular consumers using the package 
to think about the technicality of thread_joinAll() at all.

Thinking about putting it in a mixin like:

mixin KeepRunning;

Or something