yehuda-katzs-macbookpro41:rubinius wycats$ bin/rbx -S rails -h
rbx(27569,0x7fff7050fe80) malloc: *** mmap(size=18446744069414588416) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Segmentation fault