How to create a function declaration?

[Frits van Bommel]

Marcio Faustino wrote:
> So, how can I do something like this:
> 
> /*[ my_printf.d ]**************************************************************/
> module my_printf;
> 
> extern (C) int printf(char* format, ...) {
> 	return 0;    // Just to test.
> }
> /******************************************************************************/
> /*[ test.d ]*******************************************************************/
> import my_printf;
> 
> void main() {
> 	//printf("test\0");            // Error.
> 	my_printf.printf("test\0");    // Ok.
> }
> /******************************************************************************/
> 
> Because the line with "Error" uncommented, the compiler says:
> «test.d(5): Error: object.printf at /home/marcio/dmd/src/phobos/object.d(14)
> conflicts with my_printf.printf at my_printf.d(3)»

'printf' is problematic because object.d (which is automatically 
imported into every D module) also declares it.

That code might otherwise compile, but I'm not sure what would happen at 
the linking stage; printf is also defined in the C runtime library which 
is linked to by default. It might just use one of the two, or it might fail.