Hello Emiliano,

In this case, I think you may want to use just "Str" instead of "Nil". "Str" is the "type object" for Str objects, and you can check whether it's a string like "foo" or just the Str object by checking $!value.defined.


There's a FAQ answer that's about "Any", but it works the same way for "Str":

    http://doc.perl6.org/language/faq#What_is_%28Any%29%3F

And there's the classtut that talks about this a bit more in depth, search for "type object":

    http://doc.perl6.org/language/classtut


I hope this'll get you towards your goal. If not, just keep asking :)

Have fun with Perl 6!
  - Timo

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