Functions/variables not included in a specific module

[Menshikovk Konstantin]

Modules automatically provide a namespace scope for their 
contents, because of this, you cannot define a function declared 
in a module with a different name. It doesn't seem good to me.

For example, I wrote a library for writing application plugins. I 
want the user of my library to restrict from the abstraction 
functions below mine (like DLLMain on Windows) and I want him to 
define the plugin launch functions as an example.

It would be nice to add functions/variables independent of a 
specific module.