#object.c:
Init_Object()
{
    rb_cObject = boot_defclass("Object", 0);
    rb_cModule = boot_defclass("Module", rb_cObject);
    rb_cClass =  boot_defclass("Class",  rb_cModule);

}
=======boot_defclass========
boot_defclass(name, super)
{
    VALUE obj = rb_class_boot(super);
}
========rb_class_boot========
rb_class_boot(super)
{
    OBJSETUP(klass, rb_cClass, T_CLASS);
}
????????????????????????????????????
when call "boot_defclass("Object", 0)","rb_cClass" is not defined,why
"rb_class_boot" can call "rb_cClass"?
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