From: Brian Candler <b.candler@...>
Date: 2010-02-22T06:44:52+09:00
Subject: Re: Ruby conditionals subtlety?

defined? does appear to be a rather odd beast though. You'd have to dig 
hard through the source to explain the following (which I'm not going to 
try):

>> defined?(1)
=> "expression"
>> defined?(1+2)
=> "method"

This is with:

>> RUBY_VERSION
=> "1.8.7"
>> RUBY_PATCHLEVEL
=> 174
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