bug or a feature

[Anakreon]

I'm not sure this is a bug in g++ because is too obvious.

===========code===========
class bug {
private:
  int mem;
public:
  void meth1();
  void meth2();
};

/*
g++ (GCC) 3.3.5 (Debian 1:3.3.5-13)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
int main(int, char**) {
  //this should be an error
  bug bg;
  //if the line bellow is uncommented the linker catches the error
  //bg.meth1();
  return 1;
}
===========code==============

When I compile this file no warnings are produced.
If I compile with the -Wall flag the only warning is:
gcc_bug.cpp: In function `int main(int, char**)':
gcc_bug.cpp:18: warning: unused variable `bug bg'


I think the compiler ought to stop the compilation with an error
since the 2 methods of the bug class are not implemented.
At least a warning should be produced.

If this is not a feature, I'll make  a proper bug submission


Anakreon