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#include <iostream>
template<typename Ty>
struct Foo
{
	Foo& operator=(Foo foo){ return foo; }	
private:
	Foo& operator=(Foo& foo){ return foo; }
};
template<typename Ty>
struct Bar
{
	template<typename U>
	Bar& operator=(Bar<U> bar){ return bar; }
private:
	Bar& operator=(Bar& bar){ return bar; }
};
 
int main()
{
	Foo<int> f1, f2;
	f1 = f2;			// (1)
	Bar<int> b1, b2;
	b1 = b2;			// (2)
	f1 = Foo<int>(f2);  // (3)
	b1 = Bar<int>(b2);  // (4)
}

prog.cpp: In function ‘int main()’:
prog.cpp:21:5: error: ambiguous overload for ‘operator=’ (operand types are ‘Foo<int>’ and ‘Foo<int>’)
  f1 = f2;   // (1)
     ^
prog.cpp:21:5: note: candidates are:
prog.cpp:5:7: note: Foo<Ty>& Foo<Ty>::operator=(Foo<Ty>) [with Ty = int]
  Foo& operator=(Foo foo){ return foo; } 
       ^
prog.cpp:7:7: note: Foo<Ty>& Foo<Ty>::operator=(Foo<Ty>&) [with Ty = int]
  Foo& operator=(Foo& foo){ return foo; }
       ^
prog.cpp:15:7: error: ‘Bar<Ty>& Bar<Ty>::operator=(Bar<Ty>&) [with Ty = int]’ is private
  Bar& operator=(Bar& bar){ return bar; }
       ^
prog.cpp:23:5: error: within this context
  b1 = b2;   // (2)
     ^
prog.cpp: In instantiation of ‘Foo<Ty>& Foo<Ty>::operator=(Foo<Ty>) [with Ty = int]’:
prog.cpp:24:5:   required from here
prog.cpp:5:7: warning: reference to local variable ‘foo’ returned [-Wreturn-local-addr]
  Foo& operator=(Foo foo){ return foo; } 
       ^
prog.cpp: In instantiation of ‘Bar<Ty>& Bar<Ty>::operator=(Bar<U>) [with U = int; Ty = int]’:
prog.cpp:25:5:   required from here
prog.cpp:13:7: warning: reference to local variable ‘bar’ returned [-Wreturn-local-addr]
  Bar& operator=(Bar<U> bar){ return bar; }
       ^

Standard output is empty