Evaluation order of "+="

[Danika via Digitalmars-d]

On Monday, 11 July 2016 at 23:04:00 UTC, Johan Engelen wrote:
> LDC recently changed the evaluation order of "+=" (I think 
> unintentionally, some other eval order problems were fixed). 
> Now, it is different from DMD.
> I am going to argue that I think DMD's order is more useful in 
> the context of fibers, and would like your opinion.

I really think it is a bug, in C it prints 10. And following the 
flow, you changed the sum to 9 and after that added 1, so It 
would be 10.6