ests all <code>exe</code> conditions, and issues an error via <code><a
href="refQ.html#quit">quit</a></code> if one of the results evaluates to
<code>NIL</code>. Otherwise, <code>NIL</code> is returned. Used typically in
combination with the <code>~</code> tilde <code><a
href="ref.html#macro-io">read-macro</a></code> to insert the test code only when
in debug mode. See also <code><a href="refT.html#test">test</a></code>.

<pre>
# Start in debug mode
$ pil +
: (de foo (N)
   ~(assert (>= 90 N 10))
   (bar N)