c++/4205

[Nathanael Nerode]

This has a further perverse piece of behavior not noted before:
the following code will, correctly, give an error!
--
 template<typename F> void quirk(F f) {
   (*f) (1);
 }


// void foo(int i, int j = 5){}
 void bar(int i, int j)    {}

 int main() {
//   quirk(&foo);
   quirk(&bar);
 }
--
And so will this:
--
template<typename F> void quirk(F f) {
   (*f) (1);
 }


 void foo(int i, int j = 5){}
 void bar(int i, int j)    {}

 int main() {
   quirk(&bar);
   quirk(&foo);
 }
--

As long as "foo" is seen *first*, it 'immunizes' all subsequent functions.  
But not otherwise.  This is really bad behavior.  
It may possibly be related to c++/3784, which has similar "first one seen 
controls everyone else" behavior, though I doubt it.