1[#before_3_2] 2['Definitions before section 3.2.] 3 4 #include <boost/metaparse/string.hpp> 5 #include <boost/metaparse/int_.hpp> 6 7 #include <boost/metaparse/build_parser.hpp> 8 9 using namespace boost::metaparse; 10 11 using exp_parser1 = build_parser<int_>; 12 13