parse_uri_impl.cpp no longer compiles under Visual Studio 2008 SP1 after moving from boost 1.54 to 1.46.1 with error:

Error 34 error C2664: 'boost::spirit::qi::transform_attribute<Exposed,Transformed>::pre' : cannot convert parameter 1 from 'boost::optional' to 'boost::spirit::qi::optional &' c:\devel\boost_1_46_1\boost\spirit\home\qi\nonterminal\rule.hpp 266