This is actually a couple of questions:
1: can you extend roles by saying: role Set is extended {}
Parrot will allow this, so if Larry says OK you're fine. It may be rather significantly expensive, however. (Not nearly as bad as, say, adding an attribute at runtime to a heavily instantiated class, but...)
2: if yes, does this change variables for which you said $var does Set?
Well, it changes the *classes* for which you said $var does Set. When you throw a role on an object we're making an anonymous sub-class, so altering the role alters the anonymous subclass rather than the object in the subclass.
In other words, is the singleton class like a closure or a first-class class?
I'm not sure how the above questions relate to this, but singleton classes are real first-class classes.
--
Dan
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Dan Sugalski even samurai
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