)))
    (with-hashx-values (hash-proc associator real-table) result
      (for-each (lambda (pair)
		  (let ((handle (hashx-get-handle hash-proc associator
						  real-table (car pair))))
		    (cond ((not handle)
			   (set! size (1+ size))
			   (hashx-set! hash-proc associator real-table
				       (car pair) (cdr pair))))))
		alist))
    (ht-size! result size)
    result))