Failing minimal NQP Compiler example

test.nqp

use NQPHLL;

grammar A::Grammar is HLL::Grammar {
    token TOP { . }
}

class A::Actions is HLL::Actions {
    method TOP($/) {
        make QAST::Block.new(
            QAST::Stmts.new(
                :node($/),
                QAST::Op.new(
                    :op('say'),
                    QAST::SVal.new(
                        :value($/.Str)))));
    }
}

class A::Compiler is HLL::Compiler {

}

sub MAIN(*@ARGS) {
    my $c := A::Compiler.new();

    $c.language('A');
    $c.parsegrammar(A::Grammar);
    $c.parseactions(A::Actions);

    $c.command_line(@ARGS, :encoding('utf8'));
}