[boost] [spirit] Causes a blizzard of warning from Boost.Format under MSVC?

From: John Maddock (john_at_[hidden])
Date: 2007-12-15 05:12:24

I'm at a loss to explain this, but this program:

#include <boost/math/special_functions.hpp>

int main()
{
  boost::math::erf(2);
}

Compiles cleaning with MSVC-8, but as soon as I add a particular spirit 
#include:

#include <boost/math/special_functions.hpp>
#include <boost/spirit/utility/distinct.hpp>

int main()
{
  boost::math::erf(2);
}

Then Boost.Format (used internally be Boost.Math for error message 
formatting) issues a whole blizzard of warnings, that I actually thought I 
had fixed.  I've checked Spirit for mismatched #pragma push/pop 
declarations, but they all look OK to me.  Does anyone have any ideas what 
may be going on here, 'cos I'm stumped and the warnings are really very 
annoying!

Many thanks, John.