mod >= other   →  true, false, or nil

Returns true if mod is an ancestor of other, or the two modules are the same. Returns nil if there’s no relationship between the two. (Think of the relationship in terms of the class definition: "class A<B" implies "B>A").

Source Code

/*
* call-seq:
*   mod >= other   =>  true, false, or nil
*
* Returns true if <i>mod</i> is an ancestor of <i>other</i>, or the
* two modules are the same. Returns 
* <code>nil</code> if there's no relationship between the two. 
* (Think of the relationship in terms of the class definition: 
* "class A<B" implies "B>A").
*
*/

static VALUE
rb_mod_ge(mod, arg)
   VALUE mod, arg;
{
   switch (TYPE(arg)) {
     case T_MODULE:
     case T_CLASS:
       break;
     default:
       rb_raise(rb_eTypeError, "compared with non class/module");
   }

   return rb_class_inherited_p(arg, mod);
}