title: How to terminate a scheme program early? (Is there an "exit"?)
body: <p>I would like something like:</p>
  
  <p><code>(cond ((&lt; x 3) (and (display "Error Message") (exit)))</code></p>
  
  <p><code>(else (foo y))</code></p>
  
  <p>In other words I'd like to display a message and terminate when a condition is met. How can I do this? Is there such an exit function?</p>
  
  <p>Thanks in advance!</p>