Selective and renamed imports

[Christian Kamm]

Kagamin wrote:
> afaik currently all imports include symbols into the importing module.
> 
> --- a.d ---
> int z;
> 
> --- b.d ---
> import a;
> a.z is available as b.z now.

No, this import does not introduce a new symbol b.z. It just adds a note to 
b's root scope saying "if a symbol isn't found here, check in a".

It works differently for selective imports and that's cause for the problems 
with them: If you had done 'import a : z;' there would actually be a new 
symbol b.z.