File: ACL2-PC_colon__colon_FAIL.html

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<html>
<head><title>ACL2-PC_colon__colon_FAIL.html  --  ACL2 Version 3.1</title></head>
<body text=#000000 bgcolor="#FFFFFF">
<h3>ACL2-PC::FAIL</h3>(macro)
<code>   </code>cause a failure
<pre>Major Section:  <a href="PROOF-CHECKER-COMMANDS.html">PROOF-CHECKER-COMMANDS</a>
</pre><p>


<pre>
Examples:
fail
(fail t)
<p>
General Form:
(fail &amp;optional hard)
</pre>

This is probably only of interest to writers of macro commands.
The only function of <code>fail</code> is to fail to ``succeed''.<p>

The full story is that <code>fail</code> and <code>(fail nil)</code> simply return
<code>(mv nil nil state)</code>, while <code>(fail hard)</code> returns <code>(mv hard nil state)</code> if
<code>hard</code> is not <code>nil</code>.  See also <code>do-strict</code>, <code>do-all</code>, and <code>sequence</code>.
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