gcc-4.8.1/gcc/testsuite/g++.dg/template/friend17.C


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template <class T>
struct X {
  template <class U> void operator+=(U);
  
  template <class V>
  template <class U>
  friend void X<V>::operator+=(U);
};

int main() {   
  X<int>() += 1.0;
}