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vector-pop  vector ⇒  element
vector—a vector with a fill pointer.
element—an object.
Decreases the fill pointer of vector by one, and retrieves the element of vector that is designated by the new fill pointer.
 (vector-push (setq fable (list 'fable))
              (setq fa (make-array 8
                                   :fill-pointer 2
                                   :initial-element 'sisyphus))) ⇒  2 
 (fill-pointer fa) ⇒  3 
 (eq (vector-pop fa) fable) ⇒  true
 (vector-pop fa) ⇒  SISYPHUS 
 (fill-pointer fa) ⇒  1 
The fill pointer is decreased by one.
The value of the fill pointer.
An error of type type-error is signaled if vector does not have a fill pointer.
If the fill pointer is zero, vector-pop signals an error of type error.
vector-push , vector-push-extend, fill-pointer