From: Gareth Adams <gareth.adams@...>
Date: 2007-12-14T23:58:39+09:00
Subject: Re: Enforce implementation of Module method

Phrogz <phrogz <at> mac.com> writes:
> module Parenting
>   def children
>     raise "OOPS!" #Better error message here
>   end
> end
> 
> If a class defines that method, it will shadow the module method. As
> long as the class method doesn't try to call super, you should be good
> to go.

And of course, there's a rather handy NotImplementedError class just sat there
in Ruby code if you want to use it.