From: Brian Candler <lists@...>
Date: 2013-01-02T17:57:00+09:00
Subject: Re: numeric?

A common example:

while new_sock = sock.accept
  Thread.new(new_sock) do |s|
     ... do stuff with 's'
  end
end

If you just use new_sock directly within the thread, then its value may 
change before you use it, because if a new incoming connection arrives 
the outer loop will reassign a new value to it.

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