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<head><title>SET-BACKCHAIN-LIMIT.html -- ACL2 Version 3.1</title></head>
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<h2>SET-BACKCHAIN-LIMIT</h2>Sets the backchain-limit used by the rewriter
<pre>Major Section: <a href="EVENTS.html">EVENTS</a>
</pre><p>
Note: This is an event! It does not print the usual event summary
but nevertheless changes the ACL2 logical <a href="WORLD.html">world</a> and is so
recorded. Moreover, its effect is to set the <code><a href="ACL2-DEFAULTS-TABLE.html">acl2-defaults-table</a></code>, and
hence its effect is <code><a href="LOCAL.html">local</a></code> to the book or <code><a href="ENCAPSULATE.html">encapsulate</a></code> form
containing it; see <a href="ACL2-DEFAULTS-TABLE.html">acl2-defaults-table</a>.<p>
This event sets the global <code><a href="BACKCHAIN-LIMIT.html">backchain-limit</a></code> used by the ACL2
rewriter. It must be <code>nil</code> or a non-negative integer.
(See <a href="BACKCHAIN-LIMIT.html">backchain-limit</a> for details.)
<p>
<pre>
:set-backchain-limit nil ; do not impose any additional limits
:set-backchain-limit 0 ; allow only type reasoning for relieving
; hypotheses
:set-backchain-limit 500 ; allow backchaining to a depth of no more
; than 500
(set-backchain-limit 500) ; same as above
</pre>
The default limit is <code>nil</code>.
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