From: Robert Dober <robert.dober@...>
Date: 2007-01-25T00:21:01+09:00
Subject: Re: Trickery in the ancestors chain

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On 1/24/07, Paolo Nusco Perrotta <paolo.nusco.perrotta@gmail.com> wrote:
>
> Try this:
>
>   module M
>     def hello; p 'M'; end
>   end
>
>   class C
>     def hello; p 'C'; end
>   end
>
>   class D < C; end
>
>   class C; include M; end
>   class D; include M; end
>   D.ancestors                      -> [D, C, M, Object, Kernel]
>   D.new.hello                       -> "C"
>
>
> Now restart from a clean slate and change the last few lines:
>
>   class D; include M; end
>   class C; include M; end
>   D.ancestors                      -> [D, M, C, M, Object, Kernel]
>   D.new.hello                       -> "M"
>
>
> Ruby silently prevents you from including a module that has been
> included by an ancestor. Why?
>
>
>
Stop Press
I can reproduce that behavior but only on my cygwin ruby 1.8.4 I cannot
reproduce it in irb, irb seems to produce the correct behaviour (the first
one for both versions).

As soon as I'll have time I'll fire up tests on my Ubuntu with 1.8.5 and 1.9
.

Robert

-- 
"The best way to predict the future is to invent it."
- Alan Kay

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