Right way to handle memory allocation failures (related to fix for array.c issue)?

To fix the integer wrap in rb_array_fill, there is a simple check that
can be done to determine if the newly calculated length to pass to
realloc wrapped. However, I am unsure of what to do if an overflow is
detected. Raise a runtime exception? If anyone has an opinion of what
is the most ruby-esque way is to handle the situation, I would
appreciate it. Otherwise, I will probably just raise a runtime error
exception.

Cheers,
Dom