COMMIT One more require 'fiber' I missed.	http://github.com/rubyspec/rubyspec/commit/85a3a2a9e33854bd0ca96d826c7307db26c668d4
COMMIT Add guards to prevent requires of 'fiber' and 'continuation' on JRuby.	http://github.com/rubyspec/rubyspec/commit/e41b25f86599619c6295308e5296439a0a4a1e7c