varargs matches remaining parameters
There was an attempt to compare pointers to functions that had similar parameters, but with one having variable arguments.
The following example causes this warning:
int ( *pFunc1) ( int a, ... );
int ( *pFunc2) ( int a, int b);
if ( pFunc1 != pFunc2 ) {}; // warning
This extension can prevent your code from being portable to other compilers and will generate an error under the /Za command-line option.