[Bug:1.9] test_dup(TestIO) may cause infinite loop

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Index: test/ruby/test_io.rb

— test/ruby/test_io.rb (revision 19381)
+++ test/ruby/test_io.rb (working copy)
@@ -633,7 +633,7 @@
loop {a << IO.pipe}
end
assert_raise(Errno::EMFILE, Errno::ENFILE, Errno::ENOMEM) do

  •  loop {a[-1][0].dup; a[-1][1].dup}
    
  •  loop {a << [a[-1][0].dup, a[-1][1].dup]}
    
    end
    a.each do |r, w|
    r.close unless !r || r.closed?

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Applied in changeset r19396.

http://redmine.ruby-lang.org/issues/show/568