The D ecosystem in Debian with free-as-in-freedom DMD

[Adam D. Ruppe via Digitalmars-d]

On Tuesday, 11 April 2017 at 21:08:05 UTC, Johannes Pfau wrote:
> I'd think of .d files as a superset of .di files.

Note that there is zero difference between them. The compiler 
treats both *exactly* the same way (it just considers the 
extensions to be aliases of each other).

It is just a naming convention.