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varargs matches remaining parameters
Under the default Microsoft extensions (/Ze), a pointer to a function matches a pointer to a function with similar, but variable, arguments.
Example
// C4220.c
// compile with: /W4
int ( *pFunc1) ( int a, ... );
int ( *pFunc2) ( int a, int b);
int main()
{
if ( pFunc1 != pFunc2 ) {}; // C4220
}
Such pointers do not match under ANSI compatibility (/Za).