From: Francis Fish <francis.fish@...>
Date: 2009-01-16T18:56:59+09:00
Subject: Re: Does Ruby support exception wrapping (exception chaining

Hi guys

I came up with this based on your ideas but it doesn't have the 
complexity:

  class ParseFailed < Exception ; end
# ...
    rescue Exception => e
    raise ParseFailed.new("Page generation failed #{e}: 
#{e.backtrace.join("\n")}")

This raises my named exception with the text and full backtrace of the 
one thrown as the message. Not as good as chaining Exception.new(e) but 
it allows you to see the trace in the message without having to do 
another backtrace.

It met my needs and seems a little simpler than hacking another 
exception class.
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