+ operators

[bearophile]

Jonathan M Davis:

> Certainly, once range propagation has been fully implemented, this particular 
> will work without needing any casts, but as soon as the compiler doesn't know 
> what the values of x and y are, I believe that it would still end up 
> complaining.

I am not sure D range propagation is supposed to work across different lines of code (I think not).

Bye,
bearophile