matz	2007-02-02 18:47:55 +0900 (Fri, 02 Feb 2007)

  New Revision: 11613

  Modified files:
    trunk/ChangeLog
    trunk/variable.c
    trunk/vm.c

  Log:
    * vm.c (eval_get_cvar_base): destination for class variable access
      is now strictly innermost surrounding class or module.  warned
      if accessed from toplevel.
    
    * variable.c (rb_cvar_get): new class variable look-up scheme:
      1) look up in the class.  2) if the class is singleton attached
      to a class (i.e. metaclass) then start look up in the attached
      class and its ancestors. 3) otherwise, look-up in ancestors of
      the class.
    
    * eval.c (cvar_cbase): destination for class variable access is
      the class/module that holds the method, or cbase outside of
      methods.