Derived class with shared pointers and .def_readwrite

I think I've found a problem when having a derived classes and using
smart pointers to hold them.

Having:

class A
{
};

class B : public A
{
public:

    int x;
};

and binding with:

    module(L)
    [
        class_< A, shared_ptr<A> >( "A" )
            .def( constructor<>() ),

        class_< B, A, shared_ptr<A> >( "B" )
            .def( constructor<>() )
            .def_readwrite( "x", &B::x )
    ];

then running the Lua code:

b = B()
b.x = 1234

results with the error:

No matching overload found, candidates:
void <unknown>(B&,int const&)

The error disappears if you either:
a) Don't use shared_ptr
b) Don't tell luabind that B is derived from A, i.e. in the second class
binding, remove the base class and change the shared pointer to B. 

Oh, and while I remember in the docs in section 8.7 at the end it says
"base" where it should say "derived".  I've attached a patch.

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--- docs.rst~	2010-01-07 22:51:11.351893288 +1300
+++ docs.rst	2010-01-28 02:46:16.038580848 +1300
@@ -887,7 +887,7 @@
         [
             class_<base, boost::shared_ptr<base> >("base")
                 .def(constructor<>()),
-            class_<derived, base, **boost::shared_ptr<base>** >("base")
+            class_<derived, base, **boost::shared_ptr<base>** >("derived")
                 .def(constructor<>())
         ];