From: Pat Maddox <devlists-ruby-talk@...>
Date: 2006-08-10T15:46:40+09:00
Subject: Why can't I alias_method :remove_method ?

irb(main):001:0> class Foo
irb(main):002:1> alias_method :old_remove_method, :remove_method
irb(main):003:1> end
NameError: undefined method `remove_method' for class `Foo'
        from (irb):2:in `alias_method'
        from (irb):2

But you can call remove_method from within the class, so why can't you  
alias it?  What other methods can't you alias?  Or rather, what are the  
restrictions/conditions under which you must use alias_method?
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