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<head><title>ACL2-PC_colon__colon_RESTORE.html -- ACL2 Version 3.1</title></head>
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<h3>ACL2-PC::RESTORE</h3>(meta)
<code> </code>remove the effect of an UNDO command
<pre>Major Section: <a href="PROOF-CHECKER-COMMANDS.html">PROOF-CHECKER-COMMANDS</a>
</pre><p>
<pre>
Example and General Form:
restore
</pre>
<p>
<code>Restore</code> removes the effect of an <code>undo</code> command. This always works as
expected if <code>restore</code> is invoked immediately after <code>undo</code>, without
intervening instructions. However, other commands may also interact
with <code>restore</code>, notably ``sequencing'' commands such as <code>do-all</code>,
<code>do-strict</code>, <code>protect</code>, and more generally, <code>sequence</code>.<p>
<strong>Note:</strong> Another way to control the saving of proof-checker state is
with the <code>save</code> command; see the documentation for <code>save</code>.<p>
The <code>restore</code> command always ``succeeds''; it returns
<code>(mv nil t state)</code>.
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