From: Brian Candler <b.candler@...>
Date: 2009-08-19T16:04:14+09:00
Subject: Re: if defined on var

Bertram Scharpf wrote:
> Ugh, I did not know that `y' is a method.

Only if you "require 'yaml'"

One other thing to note. Deciding whether something is a local variable 
happens at parse time, independent of whether the line is actually 
excuted or not. So:

  if false
    x = 123
  end
  p defined? x    # "local_variable"
  p x             # nil
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