C style 'static' functions

[John Burton via Digitalmars-d-learn]

In C I can declare a function 'static' and it's only visible from 
within that implementation file. So I can have a static function 
'test' in code1.c and another non static function 'test' in 
utils.c and assuming a suitable prototype I can use 'test' in my 
program and the one in code1.c will not interfere.

In D it seems that declaring functions as static in a module does 
not affect visibility outside of a module. So if I declare a 
static function in one module with a specific name that is just 
used in internally for the implementation, and then define a 
function with the same name in another module that is intended to 
by 'exported' then in my main program they still conflict and I 
have to take steps to avoid this.

It looked as if I could use 'private' instead of static but 
although this prevents me from calling the "private" function, it 
still conflicts with the one I want to call.

In C++ I could use static or an anonymous namespace for 
implementation functions, but there doesn't seem to be anything 
similar in D.
Is there any way to achieve what I want in D (Private 
implementation functions)