calc example -- src/parser/actions.pm

class Calc::Grammar::Actions;

method TOP($/) {
    make PAST::Op.new( $<statement>.ast, :pirop('say') );
}

method statement($/) {
    make PAST::Op.new( $<term>[0].ast,
                       $<term>[1].ast,
                       :pirop('add')
                     );
}

method term($/) {
    make PAST::Val.new( :value(+$/) );
}