gcc/testsuite/g++.dg/warn/Wunused-function3.C - gcc - Git at Google

 // { dg-options -Wunused-function }

 namespace
 {
   template <class T> struct A
   {
     friend void f(A) { }
   };

   A<int> a;
 }
	// { dg-options -Wunused-function }

	namespace
	{
	template <class T> struct A
	{
	friend void f(A) { }
	};

	A<int> a;
	}