CLHS: Section 23.1.2.1

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## 23.1.2.1 Examples of Effect of Readtable Case on the Lisp Reader

     (defun test-readtable-case-reading ()
       (let ((*readtable* (copy-readtable nil)))
         (format t "READTABLE-CASE  Input   Symbol-name~
                  ~%-----------------------------------~
                  ~%")
         (dolist (readtable-case '(:upcase :downcase :preserve :invert))
           (setf (readtable-case *readtable*) readtable-case)
           (dolist (input '("ZEBRA" "Zebra" "zebra"))
             (format t "~&:~A~16T~A~24T~A"
                     (string-upcase readtable-case)
                     input
                     (symbol-name (read-from-string input)))))))

The output from `(test-readtable-case-reading)` should be as follows:

     READTABLE-CASE     Input Symbol-name
     -------------------------------------
        :UPCASE         ZEBRA   ZEBRA
        :UPCASE         Zebra   ZEBRA
        :UPCASE         zebra   ZEBRA
        :DOWNCASE       ZEBRA   zebra
        :DOWNCASE       Zebra   zebra
        :DOWNCASE       zebra   zebra
        :PRESERVE       ZEBRA   ZEBRA
        :PRESERVE       Zebra   Zebra
        :PRESERVE       zebra   zebra
        :INVERT         ZEBRA   zebra
        :INVERT         Zebra   Zebra
        :INVERT         zebra   ZEBRA

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