 exists.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/tools/ant/taskdefs/Exit.html#setUnless-java.lang.String-">setUnless</a></span>(java.lang.String&nbsp;c)</code>
<div class="block">Only fail if the given expression evaluates to false or tno
 property of the given name exists.</div>
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