From: Brian Candler <b.candler@...>
Date: 2009-03-06T20:10:43+09:00
Subject: Re: What's wrong with lambda and class

All fully explained at
http://innig.net/software/ruby/closures-in-ruby.rb

But in summary, the key difference between Proc/block and lambda is that 
return within a Proc/block returns from method it was invoked within, 
whereas return within a lambda just returns from the lambda itself.
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