From: Martin DeMello <martindemello@...>
Date: 2009-12-21T17:26:56+09:00
Subject: redirecting stderr in irb

Redirecting $stderr in irb doesn't work but redirecting
$DEFAULT_OUTPUT does. Can anyone explain why this happens? Also, is
there any clever way to run irb in a thread and then redirect
$DEFAULT_OUTPUT only for that thread?

$ irb
irb(main):001:0> require 'stringio'
=> true
irb(main):002:0> $stderr = StringIO.new
=> #<StringIO:0x9b87698>
irb(main):003:0> hello
NameError: undefined local variable or method `hello' for main:Object
       from (irb):3
       from /usr/bin/irb:12:in `<main>'
irb(main):004:0> $> = StringIO.new
irb(main):005:0> hello
irb(main):006:0>

(Sorry if you're seeing this twice, didn't get any response in
ruby-core so I'm forwarding to ruby-talk)

martin