Hi,

> Suppose you'd like to use ocamldoc to output a dot file to understand
> the dependencies of your program, if you manage to achieve what you
> want to do you'll miss that dependency.
> 
> The more info there is in the source (vs. the build procedure) the
> easier it is to understand the program.

In general I would agree, but in this particular instance the extra
module is just a plugin which registers itself with the main module
via a callback.  It's entirely optional and not a dependence of the
main program -- hence why an automated build system thinks it may
be safely discarded.

Cheers,
Dario Teixeira