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<h3 class="section">Error and Warning Messages</h3>



   <p><code>as</code> may write warnings and error messages to the standard error

file (usually your terminal).  This should not happen when  a compiler

runs <code>as</code> automatically.  Warnings report an assumption made so

that <code>as</code> could keep assembling a flawed program; errors report a

grave problem that stops the assembly.



   <p>Warning messages have the format



<pre class="smallexample">     file_name:<b>NNN</b>:Warning Message Text

     </pre>



<p>(where <b>NNN</b> is a line number).  If a logical file name has been given

(see <a href="File.html#File"><code>.file</code></a>) it is used for the filename, otherwise the name of

the current input file is used.  If a logical line number was given

(see <a href="Line.html#Line"><code>.line</code></a>)

then it is used to calculate the number printed,

otherwise the actual line in the current source file is printed.  The

message text is intended to be self explanatory (in the grand Unix

tradition).



   <p>Error messages have the format

<pre class="smallexample">     file_name:<b>NNN</b>:FATAL:Error Message Text

     </pre>

   The file name and line number are derived as for warning

messages.  The actual message text may be rather less explanatory

because many of them aren't supposed to happen.



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