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  # Silences any stream for the duration of the block.
  #
  #   silence_stream(STDOUT) do
  #     puts 'This will never be seen'
  #   end
  #
  #   puts 'But this will'
  def silence_stream(stream)
    old_stream = stream.dup
    stream.reopen(RUBY_PLATFORM =~ /mswin/ ? 'NUL:' : '/dev/null')
    stream.sync = true
    yield
  ensure
    stream.reopen(old_stream)
  end