Thanks for the report, looks like nobu committed a fix as r49088

> This spec appears to cause the segfault mentioned in
> http://rubini.us/2014/12/31/matz-s-ruby-developers-don-t-use-rubyspec/
> today.

Fwiw, I do run "make test-rubyspec" before I commit,
but that's naruse's repo which I guess is different..

Like many projects nowadays, I won't bother contributing to rubyspec
because it requires an account on a proprietary service provider.
Free Software (e.g. Ruby) needs Free tools:
  http://mako.cc/writing/hill-free_tools.html