infog/test-infodir/texinfo_html/_0040error.html - texinfo - Git at Google

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 <p>
 Next: <a href="_0040equiv.html" accesskey="n" rel="next"><code class="code">@equiv{}</code> (&equiv;): Indicating Equivalence</a>, Previous: <a href="_0040print.html" accesskey="p" rel="prev"><code class="code">@print{}</code> (-|): Indicating Generated Output</a>, Up: <a href="Glyphs-for-Programming.html" accesskey="u" rel="up">Glyphs for Programming</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p>
 </div>
 <hr>
 <h4 class="subsection" id="g_t_0040error_007b_007d-_0028error_002d_002d_003e_0029_003a-Indicating-an-Error-Message">11.9.5 <code class="code">@error{}</code> (error&rarr;): Indicating an Error Message</h4>

 <a class="anchor" id="Error-Glyph"></a><a class="index-entry-id" id="index-Error-message_002c-indicating"></a>
 <a class="index-entry-id" id="index-error"></a>

 <p>A piece of code may cause an error when you evaluate it.  You can
 designate the error message with the <code class="code">@error{}</code> command.
 </p>
 <p>The <code class="code">@error{}</code> command is displayed as &lsquo;<samp class="samp">error&rarr;</samp>&rsquo;, either
 the word &lsquo;error&rsquo; in a box in the printed output, the word error
 followed by an arrow in other formats or (when no arrow is available)
 &lsquo;<samp class="samp">error--&gt;</samp>&rsquo;.
 </p>
 <p>Thus,
 </p>
 <div class="example">
 <pre class="example-preformatted">@lisp
 (+ 23 'x)
 @error{} Wrong type argument: integer-or-marker-p, x
 @end lisp
 </pre></div>

 <p>produces
 </p>
 <div class="example lisp">
 <pre class="lisp-preformatted">(+ 23 'x)
 error&rarr; Wrong type argument: integer-or-marker-p, x
 </pre></div>

 <p>This indicates that the following error message is printed
 when you evaluate the expression:
 </p>
 <div class="example lisp">
 <pre class="lisp-preformatted">Wrong type argument: integer-or-marker-p, x
 </pre></div>

 <p>The word &lsquo;<samp class="samp">error&rarr;</samp>&rsquo; itself is not part of the error message.
 </p>

 </div>


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	Copyright (C) 1988, 1990-1993, 1995-1999, 2001-2022 Free Software Foundation, Inc.

	Permission is granted to copy, distribute and/or modify this document
	under the terms of the GNU Free Documentation License, Version 1.3 or
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	<div class="subsection-level-extent" id="g_t_0040error">
	<div class="nav-panel">
	<p>
	Next: <a href="_0040equiv.html" accesskey="n" rel="next"><code class="code">@equiv{}</code> (&equiv;): Indicating Equivalence</a>, Previous: <a href="_0040print.html" accesskey="p" rel="prev"><code class="code">@print{}</code> (-\|): Indicating Generated Output</a>, Up: <a href="Glyphs-for-Programming.html" accesskey="u" rel="up">Glyphs for Programming</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p>
	</div>
	<hr>
	<h4 class="subsection" id="g_t_0040error_007b_007d-_0028error_002d_002d_003e_0029_003a-Indicating-an-Error-Message">11.9.5 <code class="code">@error{}</code> (error→): Indicating an Error Message</h4>

	<a class="anchor" id="Error-Glyph"></a><a class="index-entry-id" id="index-Error-message_002c-indicating"></a>
	<a class="index-entry-id" id="index-error"></a>

	<p>A piece of code may cause an error when you evaluate it. You can
	designate the error message with the <code class="code">@error{}</code> command.
	</p>
	<p>The <code class="code">@error{}</code> command is displayed as ‘<samp class="samp">error→</samp>’, either
	the word ‘error’ in a box in the printed output, the word error
	followed by an arrow in other formats or (when no arrow is available)
	‘<samp class="samp">error--></samp>’.
	</p>
	<p>Thus,
	</p>
	<div class="example">
	<pre class="example-preformatted">@lisp
	(+ 23 'x)
	@error{} Wrong type argument: integer-or-marker-p, x
	@end lisp
	</pre></div>

	<p>produces
	</p>
	<div class="example lisp">
	<pre class="lisp-preformatted">(+ 23 'x)
	error→ Wrong type argument: integer-or-marker-p, x
	</pre></div>

	<p>This indicates that the following error message is printed
	when you evaluate the expression:
	</p>
	<div class="example lisp">
	<pre class="lisp-preformatted">Wrong type argument: integer-or-marker-p, x
	</pre></div>

	<p>The word ‘<samp class="samp">error→</samp>’ itself is not part of the error message.
	</p>

	</div>



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