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<head><title>ACL2-PC_colon__colon_ORELSE.html -- ACL2 Version 3.1</title></head>
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<h3>ACL2-PC::ORELSE</h3>(macro)
<code> </code>run the first instruction; if (and only if) it ``fails'', run the
<code> </code>second
<pre>Major Section: <a href="PROOF-CHECKER-COMMANDS.html">PROOF-CHECKER-COMMANDS</a>
</pre><p>
<pre>
Example:
(orelse top (print "Couldn't move to the top"))
<p>
General form:
(orelse instr1 instr2)
</pre>
Run the first instruction. Then if it ``fails'', run the second
instruction also; otherwise, stop after the first.<p>
This instruction ``succeeds'' if and only if either <code>instr1</code>
``succeeds'', or else <code>instr2</code> ``succeeds''. If it ``fails'', then
the failure is soft.
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