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#include <iostream>
 
int foo(struct NonExistingNeverDeclaredType* arg) {
  return sizeof(arg);
}
 
typedef typename NonExistingNeverDeclaredType::make_error x;
int main() {
  std::cout << foo(nullptr) << std::endl;
  return 0;
}

prog.cpp:7:18: error: incomplete type 'NonExistingNeverDeclaredType' named in nested name specifier
typedef typename NonExistingNeverDeclaredType::make_error x;
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.cpp:3:16: note: forward declaration of 'NonExistingNeverDeclaredType'
int foo(struct NonExistingNeverDeclaredType* arg) {
               ^
1 error generated.

Standard output is empty