Hi Eric,

> boost/proto/matches.hpp:391:13: error: invalid use of incomplete type 
> 'struct boost::proto::detail::uncvref<arity_caller::CanBeCalled<Plus2, 
> mpl_::integral_c<int, 2> > >::type'
> Now look at how you've defined CanBeCalled: 
> template<typename Fun, typename Int> 
> struct CanBeCalled;

Thanks. I added another specialisation for mpl::integral_c<int, n> > and it 
worked. But, now I'm wondering why on earth was that basically needed? I had 
never touched mpl::integral_c in my code snippet. That should have been 
generated by Proto then, right? And, in that case, may I please know why?

On the other hand, I'm wondering why GCC never nagged about the need for 
mpl::integral_c<int, 1> when I wrote:

EW1<InpPool, GameState, AmmoMsg>() >> Plus1();

In other words, why is mpl::int_<n> used for the above line (when n == 1), 
whereas mpl::integral_c<int, n> is used for the following one (when n == 2)?

(EW1<InpPool, GameState, AmmoMsg>() || EW1<InpPool, GameState, AmmoMsg>()) >> 


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