Sure. A type should be used only when it is useful.
In your case, we would need a Trait, but short of that, you can just not define the type at all.
Cheers, Doru
On Apr 2, 2013, at 8:27 PM, Yuriy Tymchuk yuriy.tymchuk@me.com wrote:
But it becomes e bit cumbersome. For example in Smalltalk AST a variable can be either used in a variable expression or in assignment expression, so you can't just define a parrentExpression relation
Uko
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