I'm working on my first use of RecDescent (way-cool Damian). Consider this small piece of a grammar: 
foo: bar
        {
            ::processBar($item1)
        }
Under certain circumstances (bad input) processBar will fail. Now, I understand that if I return undef, the production should fail, etc. What I want to do is be able to provide the error message that processBar() has "calculated". I tried adding <error: ${::getError()}> after the action, but that doesn't seem to have worked... What's the best way to do this. Should processBar just "print STDERR 'msg'"?

In reply to RecDescent error handling by dcorbin

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