Can I use [[no return]] on non-void returning functions?

I've never seen [[ noreturn ]] used on non-void returning functions before.

Is the following well defined?

[[ noreturn ]] int function();

int function(){
  while(true){/* impl */}
  return 0;
}

The reason the return type must be int, is because the function is passed to another function via a function pointer.

So assuming the caller looks something like this:

//call the non-returning function
int var = (*fptr)();

//use var some way (even though the function will never actually return)
std::cout << var;

will this exhibit any kind of undefined behavior?