From: Daniel Berger <djberg96@...>
Date: 2010-04-21T21:37:13+09:00
Subject: [ruby-core:29685] Re: "include X; include Y" vs "include X, Y"

Shugo Maeda wrote:
> Hi,
> 
> 2010/4/21 Daniel Berger <djberg96@gmail.com>:
>> It seems that when including multiple modules with identical method
>> names there are different results when using multiple includes versus
>> a single include with multiple arguments. In the the former case we
>> get a "last method definition wins" but in the latter it's "first
>> method definition wins".
>>
>> Is this expected behavior? If so, where is it documented?
> 
> It is intended.
> 
> The behavior of `include X, Y' was initially the same as `include X;
> include Y', but the order of inclusion was changed to the same order
> as the return value of Module#ancestors.
> 
> module Foo
> end
> module Bar
> end
> class Baz
>   include Foo, Bar
> end
> p  Baz.ancestors #=> [Baz, Foo, Bar, Object, Kernel]

Interesting, thanks.

Dan