From: Sam Ruby <rubys@...>
Date: 2008-02-06T03:00:43+09:00
Subject: reopen: can't change access mode from "w+" to "w"?

I ran 'rake test' on test/spec [1], using

ruby 1.9.0 (2008-02-06 revision 15384) [i686-linux]

I get "rake aborted!".  After some investigation, I tracked it down to a 
failure in should-output.rb [2], and reduced the issue to a small test case:

===

require 'tmpdir'

save = STDOUT.dup
STDOUT.reopen File.open(File.join(Dir.tmpdir, "should_output_#{$$}"), "w+")
puts 'hi'
out = STDOUT.dup
STDOUT.reopen save

out.rewind
p out.read

===

with Ruby 1.8.6, the output is:

"hi\n"

with Ruby 1.9.0, the output is:

reopen.rb:7:in `reopen': /tmp/should_output_8694 can't change access 
mode from "w+" to "w" (ArgumentError)
         from reopen.rb:7:in `<main>'

Is this a bug in Ruby 1.9?  If not, any suggestions on a workaround for 
test/spec?

- Sam Ruby

[1] http://test-spec.rubyforge.org/
[2] http://chneukirchen.org/repos/testspec/lib/test/spec/should-output.rb