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template <typename T, typename N> class Bar;
 
template <typename T, typename N>
class Foo
{
	Bar<T, N> derp;
};
 
class Bar<typename T, typename N>
{
	Foo<T, N> derp;
};
 
class Hell
{
	Foo<Bar, Foo>
};
 
int main()
{
	Hell pMe;
}

prog.cpp:9:33: error: wrong number of template arguments (1, should be 2)
 class Bar<typename T, typename N>
                                 ^
prog.cpp:1:41: error: provided for ‘template<class T, class N> class Bar’
 template <typename T, typename N> class Bar;
                                         ^
prog.cpp:9:7: error: an explicit specialization must be preceded by ‘template <>’
 class Bar<typename T, typename N>
       ^
prog.cpp:16:14: error: type/value mismatch at argument 1 in template parameter list for ‘template<class T, class N> class Foo’
  Foo<Bar, Foo>
              ^
prog.cpp:16:14: error:   expected a type, got ‘Bar’
prog.cpp:16:14: error: type/value mismatch at argument 2 in template parameter list for ‘template<class T, class N> class Foo’
prog.cpp:16:14: error:   expected a type, got ‘Foo’
prog.cpp:17:1: error: expected unqualified-id before ‘}’ token
 };
 ^
prog.cpp: In function ‘int main()’:
prog.cpp:21:7: warning: unused variable ‘pMe’ [-Wunused-variable]
  Hell pMe;
       ^

Standard output is empty