EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/metaparse/doc/getting_started_28.qbk

[#getting_started_28]

  #include <boost/mpl/negate.hpp>
  using unary_exp1 = foldr_start_with_parser< minus_token, int_token, boost::mpl::lambda<boost::mpl::negate<boost::mpl::_1>>::type >;