From: Hans Mackowiak <lists@...>
Date: 2013-02-15T21:41:42+09:00
Subject: Re: Two similar sentences have different behaviour. Is it ok?

its because is the first sample a= is parsed first so it knows that its 
an local variable, thats why  defined? a returns true

using defined is not an good idea, showing this sample:

if false
  a = 2
end
a #=> nil

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