SHA1 error

sha1-error.txt

$ rbx -e "require('sha1'); SHA1.new('foo')"
An exception occurred evaluating command line code
    StackError (StackError)

Backtrace:
                  SHA1.orig_new (new) at projects/rubinius/lib/digest/sha1.rb:11
                  SHA1.orig_new (new) at projects/rubinius/lib/digest/sha1.rb:15 (7260 times)
                              SHA1.new at projects/rubinius/lib/sha1.rb:11
              { } in Object#__script__ at -e:1
 Rubinius::BlockEnvironment#call_on_instance at kernel/common
                                                /block_environment.rb:72
         Kernel(Rubinius::Loader)#eval at kernel/common/eval.rb:73
                Rubinius::Loader#evals at kernel/loader.rb:595
                 Rubinius::Loader#main at kernel/loader.rb:779