64Bit compatibility warnings

[bearophile]

Stewart Gordon:

>  From what I gather, some C++ compilers do more than this: they have a built-in 
> understanding of the STL types, which they can use to optimise operations on them better 
> than can be done in the code implementations of them.

I presume future D compilers will recognize things like map/filter calls and compile them better :-)

Bye,
bearophile