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<a name="ATe"></a>
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<p>
Next: <a href="AT_003b.html#AT_003b" accesskey="n" rel="next">AT;</a>, Previous: <a href="AT_0026.html#AT_0026" accesskey="p" rel="prev">AT&</a>, Up: <a href="AT-commands.html#AT-commands" accesskey="u" rel="up">AT commands</a> [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Pseudo-_0028invisible_0029-operators"></a>
<h3 class="section">5.13 Pseudo (invisible) operators</h3>
<a name="index-Pseudo_002doperators"></a>
<a name="index-Operators_002c-pseudo_002d"></a>
<p>Pseudo- or invisible operators are ignored by <small>FTANGLE</small> and not
printed by <small>FWEAVE</small>; however, they retain grammatical significance
that helps out <small>FWEAVE</small> in its attempts to understand the syntax.
</p>
<a name="g_t_0040e_003a-Pseudo_002dexpression"></a>
<h4 class="subsection">5.13.1 ‘<samp>@e</samp>’: Pseudo-expression</h4>
<a name="index-Pseudo_002dexpression"></a>
<a name="index-Expression_002c-pseudo"></a>
<a name="index-_0040e"></a>
<p>‘<samp>@e</samp>’ is an invisible expression (‘pseudo-expression’)
(see <a href="Pseudo_002doperators.html#Pseudo_002doperators">Pseudo-operators</a>). It is
sometimes useful in situations where <small>FWEAVE</small>’s pretty-printing has
broken down because it didn’t properly understand the language syntax.
If, for example, <small>FWEAVE</small> failed to properly parse the C statement
</p>
<div class="example">
<pre class="example">p = (int (*))q;
</pre></div>
<p>one might get things to work properly by saying
</p>
<div class="example">
<pre class="example">p = (int (*@e))q;
</pre></div>
<p>In this particular case, one is patching up a deficiency (all right, a
bug) in <small>FWEAVE</small>’s “production rules.” (This particular bug may no
longer exist.) However, there are other situations in which the use of
‘<samp>@e</samp>’ might be necessary. Consider, for example, the C macro
definition
</p>
<div class="example">
<pre class="example">#define A(x) = x
</pre></div>
<p>Here the replacement text of the macro is ‘<samp>= x</samp>’, which by itself is
not a valid construction in C. When the ‘<samp>-1</samp>’ or ‘<samp>-2</samp>’ options
are used, <small>FWEAVE</small> will report an “irreducible
scrap sequence” in this situation (although it may typeset it correctly
anyway). To eliminate the warning message, say instead
</p>
<div class="example">
<pre class="example">#define A(x) @e = x
</pre></div>
<p>Now the fragment ‘<samp>@e = x</samp>’ is interpreted as a valid expression.
</p>
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