fails:ObjectSpace.dump_all dumps Ruby heap to string when passed output: :string
fails:ObjectSpace.dump_all dumps Ruby heap to a temporary file when passed output: :file
fails:ObjectSpace.dump_all dumps Ruby heap to a temporary file when :output not specified
fails:ObjectSpace.dump_all dumps Ruby heap to a temporary file when passed output: :nil
fails:ObjectSpace.dump_all dumps Ruby heap to stdout when passed output: :stdout
fails:ObjectSpace.dump_all dumps Ruby heap to provided IO when passed output: IO
fails:ObjectSpace.dump_all raises ArgumentError when passed not supported :output value
