boost crowd.

[Alexey Veselovsky]

I'm trying to switch from C++ to D. But I can't find some things that
I love in C++. For example in C++ I can separate module specification
and implementation. Advertising article "The Case for D" says that it
is real in D too:

"D has a true module system that supports separate compilation and
generates and uses module summaries (highbrowspeak for "header files")
automatically from source, so you don't need to worry about
maintaining redundant files separately, unless you really wish to, in
which case you can. Yep, that stops that nag right in mid-sentence."

But it is not true...