From: Brian Candler <b.candler@...>
Date: 2010-09-28T15:11:29+09:00
Subject: Re: error message, undefined method in Set

Iain Barnett wrote:
> but this throws errors:
> 
> require 'choice'
> require 'set'

Then at the top of choice.rb I'd put require 'set'.

> I'm very surprised that the order of requires (at the top of a file) can 
> affect anything in this way. Is this the way it's supposed be? If not, 
> what could be the cause?

It can be. Imagine this:

--- set.rb ---
class Set < Hash
  ...
end

--- choice.rb ---
class Set
  ... add some more methods to the class
end

If you require choice.rb first, you would get an exception when 
requiring set.rb

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