Hi,

At Mon, 6 Jun 2011 23:47:57 +0900,
Roger Pack wrote in [ruby-core:36791]:
> > rb_class_superclass() since 1.4.0.
> 
> Appears it has become public with 1.9.3?

Sure, it had been static, sorry.

So you can use it if available, RCLASS_SUPER() if defined, or
the member directly.

-- 
Nobu Nakada