Debug help - ! in data sharing concurrency

[Brother Bill]

On Sunday, 31 August 2025 at 01:27:57 UTC, Steven Schveighoffer 
wrote:
> Why would your second iteration make a difference? Purely by 
> chance! In fact, on my machine, it does not exit in either case.
>
> Welcome to the wonderful world of race conditions and 
> multithreading!

So this was just 'bad' luck with 'race conditions'.
It is not a failure of the D compiler.

FWIW, given that D supports Message Passing Concurrency, is Data 
Sharing Concurrency just there for D completeness, for those that 
want to live close to the iron.

It would seem that Message Passing Concurrency should be our 
first, second and third choice for concurrency.