/*
 *  call-seq:
 *     fixnum.next    => integer
 *     fixnum.succ    => integer
 *
 *  Returns the <code>Integer</code> equal to <i>int</i> + 1.
 *
 *     1.next      #=> 2
 *     (-1).next   #=> 0
 */

static VALUE
fix_succ(VALUE num)
{
    long i = FIX2LONG(num) + 1;
    return LONG2NUM(i);
}