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#include <iostream>
 
struct Outer
{
	template<typename T>
	struct Inner
	{
	};
 
	void f()
	{
		Inner<int> i1;
		Inner<double> i2;
	}
};
 
int main()
{
	Outer o;
	o.f();
}
 
template<>
struct Outer::Inner<double> 
{
};
 

prog.cpp: In member function ‘void Outer::f()’:
prog.cpp:12:14: warning: unused variable ‘i1’ [-Wunused-variable]
   Inner<int> i1;
              ^
prog.cpp:13:17: warning: unused variable ‘i2’ [-Wunused-variable]
   Inner<double> i2;
                 ^
prog.cpp: At global scope:
prog.cpp:24:15: error: specialization of ‘Outer::Inner<double>’ after instantiation
 struct Outer::Inner<double> 
               ^
prog.cpp:24:15: error: redefinition of ‘struct Outer::Inner<double>’
prog.cpp:6:9: error: previous definition of ‘struct Outer::Inner<double>’
  struct Inner
         ^

Standard output is empty