# Usage:# util/compile_p6grammar.pl examples/adder.grammar > Adder.pm# perl -Ilib -MAdder -e 'print Adder->add("3 + 23")->(), "\n"'grammar Adder;token add { (\d+) <.ws>? '+' <.ws>? (\d+) { return $/[0] + $/[1] }}