Dividing D Module between multiple files

[Muahmmad Adel via Digitalmars-d-learn]

I have searched online and I found no way for dividing D Module 
between multiple files.

While other languages move to making classes distributed on 
multiple files (like C#'s partial classes), D is moving in the 
opposite direction, and makes a bigger code unit in one file.

Biding every module to single file means large files, with high 
probability of merge conflicts (as more developers are working on 
the same file) makes separating developer's code from IDE 
generated code more difficult.

I need to understand the rationale behind binding the module to 
the file. Although Alexandrescu explained rationale behind 
different language design decisions in his book, he didn't 
explain this one.

Thanks