[boost] Spirit rules

[Kai-Mikael Jää-Aro]

I obviously have not understood how spirit rules are supposed to work.  The 
simple program below fails to compile (spewing out 42 lines of error messages).
If I replace the application of 'Id' with int_p directly it works OK.
What am I supposed to do to get the intended effect?

#include <iostream>
#include <boost/spirit.hpp>
using namespace std;
using namespace boost::spirit;
int main(int *argc, char *argv[])
{
  int ID;

  rule<> Id = int_p;

  if (parse(argv[1],
            Id [assign(ID)],
            space_p).full)
    {
      cout << "Value = " << ID << endl;
    }
  else
    {
      cout << "Failed\n";
    }
}
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