[fpc-pascal] dot within unit file name

[Bee]

> For clarity: I am not against this dot by itself. I can only assure you, if
> implemented, that it will not end up in 2.2.2.
> 
> As for implementing this feature: this is not so trivial as one might think.
> 
> 1. The parser needs changing. That's probably the easy part.
> 
> 2. Symbol lookups need changing. This is the hard part, because you must be
>    able to handle correctly unitname.identifier.identifier2.identifier3
> 
>    It doesn't take a lot of intelligence to see that if unitname can
>    containe one (or more) dots, this mechanism becomes suddenly a lot harder
>    because your unitname may, by accident, match unitname.identifier1 of
>    a symbol in another unit.
> 
> And doing all this in a way that doesn't change current behaviour...
> Not something you can do in a day, if you ask me.

Maybe it is a good time for me to learn fpc compiler codes now. I never 
look inside them before, just the RTL and FCL. :-D

Can you show me which files I need to look and learn in order to have 
this feature? TIA.

-Bee-

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