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<a name="g_t_002efail-expression"></a>
<h3 class="section">7.31 <code>.fail <var>expression</var></code></h3>

<a name="index-fail-directive"></a>
<p>Generates an error or a warning.  If the value of the <var>expression</var> is 500
or more, <code>as</code> will print a warning message.  If the value is less
than 500, <code>as</code> will print an error message.  The message will
include the value of <var>expression</var>.  This can occasionally be useful inside
complex nested macros or conditional assembly.
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