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#include <iostream>
 
template <int Arg>
void foo()
{
	std::cout << Arg << ' ';
}
 
template <int First, int... Rest>
void foo()
{
	std::cout << First << ' ';
	foo<Rest...>();
}
 
int main()
{
	foo<1, 2, 3>();
 
	return 0;
}

prog.cpp: In instantiation of ‘void foo() [with int First = 2; int ...Rest = {3}]’:
prog.cpp:13:14:   required from ‘void foo() [with int First = 1; int ...Rest = {2, 3}]’
prog.cpp:18:15:   required from here
prog.cpp:13:14: error: call of overloaded ‘foo()’ is ambiguous
  foo<Rest...>();
  ~~~~~~~~~~~~^~
prog.cpp:4:6: note: candidate: void foo() [with int Arg = 3]
 void foo()
      ^~~
prog.cpp:10:6: note: candidate: void foo() [with int First = 3; int ...Rest = {}]
 void foo()
      ^~~

Standard output is empty