Undefined identifier error with enum in the separate module

[bearophile]

Philippe Sigaud:

> In D, do not use the same symbol for a module and one of its 
> inner symbols.

I have seen other people hit this problem (like problems caused 
by having a "set.d" module containing a "Set" struct plus a "set" 
helper function).

Is this worth warning against (with a dmd warning/error)?

Bye,
bearophile