pretop">
  &gt; (ecase-using string= "a"
      ("a" 1)
      (("b" "c" "d") 2))
  1
  &gt; (ecase-using string= "d"
      ("a" 1)
      (("b" "c" "d") 2))
  2
  &gt; (ecase-using string= "C"
      ("a" 1)
      (("b" "c" "d") 2))
  Error: "C" fell through an ecase-using string= form; 
         the valid keys are "a", "b", "c", and "d".
  &gt;&gt;
</pre>
</p>
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