From: "Marshall T. Vandegrift" <llasram@...>
Date: 2006-09-09T01:09:21+09:00
Subject: Re: [CHALLENGE] better alias_method

ara.t.howard@noaa.gov writes:

> even more distilled:
>
>     harp:~ > cat a.rb
>     class C
>       def m() '' end
>
>       include Module.new{ def m() 'a' end }
>     end
>
>     p C.new.m
>
>
>     harp:~ > ruby a.rb
>     ""
>
>
> i find that behviour quite suprising... in fact, it seems like a bug, but i'm
> probably wrong...  thoughts?

Module inclusion is inheritance, so far as method look-up goes, right?:

    class A
    def m() '' end
    
    include Module.new{ def m() 'a' end }
    end
    
    A.ancestors # => [A, #<Module:0xb7c8d9f0>, Object, Kernel]
    A.new.m     # => ""
    
Which is effectively the same as:
    
    class B; end
    
    class C < B
      def m() '' end
    end
    
    class B
      def m() 'a' end
    end
    
    C.ancestors # => [C, B, Object, Kernel]
    C.new.m     # => ""
    
Which isn't surprising at all.

-Marshall