From: "Thomas B." <tpreal@...>
Date: 2008-08-30T03:25:37+09:00
Subject: Re: mysterious behavior of mixins

Jim Xu wrote:
> irb(main):171:0> class B < C
> irb(main):172:1>   include A
> irb(main):173:1> end
> TypeError: superclass mismatch for class B
>         from (irb):171
>         from :0

Of course you cannot do it, because a moment ago you declared the method 
B as an immediate descendant of Object, and now you want it to be the 
descendant of C. The error has nothing to do with mixins.

irb(main):046:0> class A;end
=> nil
irb(main):047:0> class B;end
=> nil
irb(main):048:0> class B<A;end
TypeError: superclass mismatch for class B
        from (irb):48
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