anchor.diff:      "setf is used to assign values to symbols.  These symbols may refer to
        variables with lexical or dynamic scope."
     (setf my-name "David")
  -  (assert-equal my-name ____)
  +  (assert-equal my-name "David")
     " 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" ____)
  +  (assert-equal "David" my-clones-name)
     (setf a 5)
     (setf b 10)
  -  (setf c ___)
  +  (setf c 50)
     (assert-equal 50 c))
   
   
  
positive.code:   (setf a 100)
    (let ((a 5)
          (b (* 10 a)))
      (assert-equal b ___)))
  
  (define-test test-let*-bindings-are-series
      "let* is like let, but successive bindings may use values of previous ones"
  
negative.code:      lexical form.  After which, the previous value, if it exists, is visible again."
    (setf a 10)
    (setf b 20)
    (assert-equal a 10)
    (assert-equal b 20)
    (let ((a 1111)
          (b 2222))
      (assert-equal a 1111)
      (assert-equal b 2222))
    (assert-equal a 10)
    (assert-equal b 20))
  
  
  (define-test test-let-default-value
      "let vars have a default value"
      (let ((x))
        (assert-equal nil x)))
  
  (define-test test-let-bindings-are-parallel
      "When defining the bindings in the let form, later bindings may not depend
  