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fix Marpa::R2::Display for rule_ids()
Thanks. Your fix is exactly right. As it happens, while researching your question, I had already stumbled over this fixed it, and uploaded it to CPAN as Marpa-R2, 2.019_001. Also in that upload is the documentation of $Marpa::R2::Context::rule: http://search.cpan.org/~jkegl/Marpa-R2-2.019_001/pod/Semantics.pod#Action_context