Undefined identifier error with enum in the separate module

[bearophile]

Philippe Sigaud:

> I'd prefer an error, with the same kind of nice message you get 
> when
> you forget to import std.stdio.
> Ideally, the error should be caught as soon as the module is 
> compiled,
> like shadowing errors (which it is, in a way).
>
> "module foo contains a member named foo. Module members cannot 
> shadow module names."

This is the ER I have opened, if you have comments or you don't 
agree with my ideas, please comment there:
https://d.puremagic.com/issues/show_bug.cgi?id=12059

Bye,
bearophile