From: Shaun Keller <shaun@27stars.co.uk>
Date: 2009-04-29T17:11:59+09:00
Subject: Re: Why does attr_accessor in module require 'self.'?

The short answer would be that

a = 'bar'

is a local variable assignment, whereas

self.a = 'bar'

is an instance variable assignment, like @a
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