anchor.diff:    (setf a 100)
     (let ((a 5)
           (b (* 10 a)))
  -    (assert-equal b ___)))
  +    (assert-equal b 1000)))
   
   (define-test test-let*-bindings-are-series
       "let* is like let, but successive bindings may use values of previous ones"
     (setf a 100)
     (let* ((a 5)
            (b (* 10 a)))
  -    (assert-equal b ___))
  -  (assert-equal a ___))
  +    (assert-equal b 50))
  +  (assert-equal a 100))
   
   
   (define-test write-your-own-let-statement
  
positive.code:     "setf is used to assign values to symbols.  These symbols my refer to
       variables with lexical or dynamic scope."
    (setf my-name "David")
    (assert-equal my-name ____)
    " In SBCL, if the symbol isn't defined as a variable, via a top-level defvar
    or let statement, the setf call may result in a warning."
    (setf my-clones-name my-name)
    (assert-equal "David" ____)
    (setf a 5)
    (setf b 10)
    (setf c ___)
    (assert-equal 50 c))
  
  
  
negative.code:   (setf a 100)
    (setf b 23)
    (setf c 456)
    (let ((a 100)
          (b 200)
          (c "Jellyfish"))
      (assert-equal a 100)
      (assert-equal b 200)
      (assert-equal c "Jellyfish"))
    (let* ((a 121) (b 200) (c 14841/121))
      (assert-equal a 121)
      (assert-equal b 200)
      (assert-equal c (+ a (/ b a)))))
  