From: ErMaker <ermaker@...>
Date: 2009-05-20T13:30:37+09:00
Subject: I want to redirect stderr to StringIO.

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>> IO.new(2).reopen(StringIO.new)
TypeError: can't convert StringIO into String
        from (irb):1:in `reopen'
        from (irb):1
>> IO.new(2).reopen(IO.new(1))
=> #<IO:0x2a81630>

StringIO also do as IO, but IO#reopen fails.

I want to redirect stderr to StringIO, but it doesn't work.

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