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boost::parser::_params
// In header: <boost/parser/parser_fwd.hpp> template<typename Context> decltype(auto) _params(Context const & context);
Returns a reference to one or more parameters passed to the bottommost rule r, by using r as r.with(param0, param1, ... paramN); multiple values will be stored within a parser::tuple. Returns none if there is no bottommost rule, or if that rule was not given any parameters.