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Next: <a href="_0024A.html#g_t_0024A" accesskey="n" rel="next">$A</a>, Previous: <a href="Strings-and-quotes.html#Strings-and-quotes" accesskey="p" rel="prev">Strings and quotes</a>, Up: <a href="Built_002din-functions.html#Built_002din-functions" accesskey="u" rel="up">Built-in functions</a> [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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<a name="Redefining-built_002din-functions"></a>
<h4 class="subsubsection">7.2.3.2 Redefining built-in functions</h4>
<p>By default, built-in functions are <em>protected</em>—that is, they may not be
redefined by an <code>@m</code> command. (To do so cavalierly invites many
kinds of weird disasters.) If it is absolutely necessary to redefine a
built-in function, use the command-line option ‘<samp>-Tb</samp>’ (see <a href="_002dTb.html#g_t_002dTb">-Tb</a>).
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<p>Many of <small>FWEB</small>’s “built-in functions” are in fact ordinary macros
that are implemented in terms of lower-level built-ins. An example is
<code>$POW</code> (see <a href="_0024POW.html#g_t_0024POW">$POW</a>), which is constructed from the built-in
function <code>$EVAL</code> (see <a href="_0024EVAL.html#g_t_0024EVAL">$EVAL</a>). By default, such macros are also
protected against redefinition; to override, use the option ‘<samp>-Tm</samp>’
(see <a href="_002dTm.html#g_t_002dTm">-Tm</a>).
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