STDERR.reopen causes exception output to be lost

[headius]

From http://jira.codehaus.org/browse/JRUBY-6154. Look for repro code there.

This appears to have been fixed on 1.7 but failing on JRuby master/9k.

If you reopen STDERR and subsequently cause an exception to be raised without rescuing it, the error output is lost and appears neither in the reopened destination nor the original terminal.

See the attached file for an example; the output:

doit.rb:1:in `foo': wrong number of arguments (0 for 1) (ArgumentError)
    from doit.rb:10:in `<main>'

is expected to be in the file "err", but the file is empty after execution.