title: Is there any function like 'try' in Racket
body: <p>Now I'm leaning schemer by looking the book <strong>The Seasoned Schemer</strong>.
  I writed the code by racket, however when I using the <code>try</code>, the schemer didn't have this method or macro. And It reported expand: unbound identifier in module in: try.
  The code as the below: (in the page 89)</p>
  
  <pre><code>(define (remove-member-first* a lat)
     (try oh (rm a lat oh) lat))
  </code></pre>
  
  <p>I've search the racket documents, but didn't find smiliar function.</p>
  
  <p>So who does know whether there are kinda function like the 'try'?</p>