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<html><head><title>XLISP *tracenable*</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
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<a href="reference-index.htm">Reference</a>
<hr>
<h1>*tracenable*</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>system variable</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlinit.c, xldbug.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt> *tracenable*</dt>
</dl>
<h2>Description</h2>
<p>The *tracenable* system variable controls whether or not the
<nobr><a href="../manual/xlisp-man-004.htm">break loop</a></nobr>
prints any back trace information on entry to the
<nobr><a href="../manual/xlisp-man-004.htm">break loop</a></nobr>. If
*tracenable* is <nobr><a href="nil.htm">NIL</a> ,</nobr> then
there will be no information printed on entry to the
<nobr><a href="../manual/xlisp-man-004.htm">break loop</a>.</nobr>
If *tracenable* is <nobr>non-<a href="nil.htm">NIL</a> ,</nobr>
then information will be printed. The 'init.lsp' initialization file sets
*tracenable* usually to <nobr><a href="nil.htm">NIL</a> ,</nobr>
which suppresses the printing.</p>
<h2>Examples</h2>
<pre class="example">
(defun foo (x) (fee x)) <font color="#008844">; define FOO</font>
(defun fee (y) (break)) <font color="#008844">; define FEE</font>
(setq *tracenable* T) <font color="#008844">; enable the back trace</font>
(setq *tracelimit* NIL) <font color="#008844">; show all the entries</font>
(foo 5) <font color="#008844">; break: **BREAK**</font>
<font color="#008844">; prints Function:#<Subr-BREAK...></font>
<font color="#008844">; Function:#<Closure-FEE...></font>
<font color="#008844">; Arguments:</font>
<font color="#008844">; 5</font>
<font color="#008844">; Function:#<Closure-FOO...></font>
<font color="#008844">; Arguments:</font>
<font color="#008844">; 5</font>
(clean-up) <font color="#008844">; from break loop</font>
(setq *tracelimit* 2) <font color="#008844">; show only 2 entries</font>
(foo 5) <font color="#008844">; break: **BREAK**</font>
<font color="#008844">; prints Function:#<Subr-BREAK...></font>
<font color="#008844">; Function:#<Closure-FEE...></font>
<font color="#008844">; Arguments:</font>
<font color="#008844">; 5</font>
(clean-up) <font color="#008844">; from break loop</font>
</pre>
<p><b>Note:</b> *tracenable* and
<a href="global-tracelimit.htm">*tracelimit*</a> system variables have to do
with back trace information at entry to a
<nobr><a href="../manual/xlisp-man-004.htm">break loop</a></nobr>
and are not related to the
<a href="trace.htm">trace</a> and
<a href="untrace.htm">untrace</a> functions.</p>
<p>See the
<a href="../manual/xlisp-man-011.htm#tracenable">*tracenable*</a>
system variable in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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