mruby/mruby — pull request #1508 by ktaobo (2013-09-21 05:26:06+00:00)
Title: Avoid segmentation fault for voidp value

`mrb_class()` function does not return
proper class information for voidp type.
So when I try to print voidp value, segmentation fault occurs.

This change creates voidp class information
and enables users to inspect its value.