I'm trying to write a polymorphic method that will accept as 
a parameter any instance of any subclass of given class. For 
example

class parent = object
   method foo = "Hello "
   method bar = "World!"
end

class son = object
   inherit parent
   method buz = "Cheers"
end

class salutation : object
   method greet : 'a. (#parent as 'a) -> string
end = object
   method greet obj = obj # foo ^ obj # bar
end


But of course, this does not work. What is problem? How can 
I get a method with a polymorphic ellipsis in its type?

Alex

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