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#include<iostream>
using namespace std;
 
template<class ... VFTs> int variadic_fun(VFTs ... vfts) { 
  return sizeof ...(vfts); 
}
 
 
template<int ... Ns> struct IntPack {
  template<class ... MemTs> static int variadic_memfun(MemTs ... MemArgs) {
    return variadic_fun(([=]() {
      cout << "MemArgs = " <<  MemArgs << "\n";
      cout << "Ns = " << Ns;
      // Note the nested expansion of MemArgs here:
      cout << "variadic_fun(MemArgs...) = " << variadic_fun(MemArgs ...) << "\n";
      cout << "MemArgs[Ns] = " <<  MemArgs[Ns] << "\n";
      return 0;
    })()...);
  }  
};
 
 
int main() {
  IntPack<0, 1, 2>::variadic_memfun("123", "ABC", "XYZ");
}

prog.cpp: In lambda function:
prog.cpp:12:32: error: parameter packs not expanded with '...':
prog.cpp:12:32: note:         'MemArgs'
prog.cpp:13:28: error: parameter packs not expanded with '...':
prog.cpp:13:28: note:         'Ns'
prog.cpp:15:69: error: expansion pattern '((const IntPack<Ns>::variadic_memfun(MemTs ...)::<lambda()>*)this)->IntPack<Ns>::variadic_memfun(MemTs ...)::<lambda()>::MemArgs' contains no argument packs
prog.cpp: In static member function 'static int IntPack<Ns>::variadic_memfun(MemTs ...)':
prog.cpp:18:9: error: expansion pattern '#'lambda_expr' not supported by dump_expr#<expression error>()' contains no argument packs

Standard output is empty