[ruby-core:18112] module inclusion and method definitions

hello,

I'm surprized by this :

    module M2; end
    class C2; include M2; end
    module M2; def m; puts "hello world" end; end
    C2.new.m

    >> hello world

    module M5; def m; puts "hello world" end; end
    module M4; include M5; end
    class C4; include M4; end
    C4.new.m

    >> hello world

    module M7; def m; puts "hello world" end; end
    module M6; end
    class C5; include M6; end
    module M6 include M7; end
    C5.new.m

    >> test.rb:13: undefined method `m' for #<C5:0xb7ca02bc> (NoMethodError)

obviously M7 is not found in the ansestors of C5, has show by the ancestors
method.

could someone enlighten me please

best regards


J辿r辿my Zurcher