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<h3 class="section">10.1 Have You Found a Bug?</h3>
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If you are not sure whether you have found a bug, here are some guidelines:
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<ul><li>If the assembler gets a fatal signal, for any input whatever, that is a
<samp><span class="command">as</span></samp> bug. Reliable assemblers never crash.
<p><a name="index-error-on-valid-input-2564"></a><li>If <samp><span class="command">as</span></samp> produces an error message for valid input, that is a bug.
<p><a name="index-invalid-input-2565"></a><li>If <samp><span class="command">as</span></samp> does not produce an error message for invalid input, that
is a bug. However, you should note that your idea of “invalid input” might
be our idea of “an extension” or “support for traditional practice”.
<li>If you are an experienced user of assemblers, your suggestions for improvement
of <samp><span class="command">as</span></samp> are welcome in any case.
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