From: Brian Candler <b.candler@...>
Date: 2010-10-01T04:35:18+09:00
Subject: Re: How to prevent overwriting methods by accident?

Run ruby with the -w flag:

$ ruby -w -e 'class String; def length; end; end'
-e:1: warning: method redefined; discarding old length

I'm not sure if there's a way to make these warnings fatal.
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